A pressure switch or sensor could be bad. The car is a 2006 Hyundai Accent. Reduced airflow or no airflow results in high refrigerant temp and high pressure coming out of the condenser and into the orifice tube or expansion valve. Evacuate the system and recharge with the correct amount of refrigerant. Suppose you notice low oil pressure at idle. Whats likely the culprit? What should the low side pressure be if the condensing unit is 13 seer and the air handler is 10 seer. 7 Causes Of Car AC Low Side Pressure Zero. It works but, the next day doesnt work. It was 85 outside and I'm guessing about 40% humidity. Without knowing static pressure this is a guess. Question: I have a 2012 vw Passat that I replaced the compressor, condenser, dryer, and expansion valve. I'm here for knowledge and to maybe give some. Answer: The system can't be zero on the high side. @Freeman, its not about tonnage. @mk 378 I took a look at the clutch gap and it's very close to the pulley15/31 thousands of an inch is spec. In this case, the reason is a damaged oil pressure gauge or sensing unit. When the filter became clogged, the valve doesnt operate properly. Question: I have a 1998 suburban with rear a/c. Perform a visual check to see if the compressor is running. Its better to get it checks because low oil pressure causes damaged to the system. Is the center hub turning? Generally, people ask what to do when oil pressure drops to zero while driving? Low pressure was normal, but the high pressure was extremely high. AC Low Side High, High Side Low: Why Does This Happen? Answer: Does the compressor kick on with the front ac on only? However, it is always better to consult a mechanic before deciding to replace any part. Could it be the hi pressure switch? I pulled a vacuum on the system prior to charging. 1. Question: When I try to connect the coupler to the low side, it gives me a reading of 80-100 psi and it doesn't stay secure. CONF-960254--. Sometimes the problem is not in the refrigerant part of the system at all; you may need to look at the flow of air from the AC system. I evacuated the system to get ready to add 134a. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesnt any interior or exterior trim or body part removal. Sounds like a blockage in the high side line to compressor discharge oort. The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. However, low oil pressure indicates a significant problem. 3. I'll do that tonight. InspectAPedia tolerates no conflicts of interest. Thus, this problem requires immediate care. However, if theres a restriction on the high side of the system in the receiver/dryer, a crimped tube in the condenser or crud accumulation in the condenser or the expansion valve or orifice tube, theres nothing to suck. Mr. Rubel is an Engine Mechanic. Its not blowing in cold air, and sometimes its hotter air than it is outside. JavaScript is disabled. If youre tracking down a wiring issue, Eautorepair.net is the better choice. Typically used on small engines. The compressor is the component of your AC system that generates the pressure that your cars coolant or refrigerant No. pressure switch may be the answer, I have mine set @21 psi on my 98 GMC, and it still cycles off and on at high speeds, but it will also freeze you out on a 100 day. On 2020-04-08 by (mod) A drop in engine oil pressure causes damage to the car. There must be a connection problem with the high side coupler. Low side of Gauge reading is 40-50 psi. "You may want to invest in a torque wrench, since your torque by feel only consists of gorilla mode. what causes high pressure on the suction line on Rheem R410a ? Is there any resistance? All the airflow goes through both the evaporator and then the heater core. 2. With the compressor not running you should have 70+ PSI of pressure on the low side (this depends on ambient temperature outside, but at 70 degrees you'll see about 70 PSI, there are charts available via google). A low pressure cut-off will prevent the Check the ambient temperature and see if the pressures match the numbers on the pressure chart. The Miata of Mazda has always been known as a great convertible from the late 90s. Is voltage being applied to the clutch coil? If the static pressure is low, a leak is probably present. 5. Answer: Never seen this before. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. However, theres also the possibility that the system has gotten overcharged with too much refrigerant. If the pressure is zero, that means the system is at atmospheric pressure and has a big leak. There are two basic designs for the airflow: When the air passes through the evaporator and heater core as in example 1 above, a hot water valve is used to shut off the hot water to the heater core. The system is probably leaking. Thanks. Adj. Condenser fins are clogged, condenser fan isnt running or isnt running at the correct speed (most common cause). I also agree with the others that you might consider getting an A/C shop to look at this as A/C work can be a bit dangerous on top of causing even more damage to the system. Refrigerant Type: 134A. yes, the electric fan closest to the radiator. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. 04-09-2005, 01:47 Engine oil lubricates parts of the combustion and increases efficiency. Where else should I be looking? We also explain the various causes of liquid slugging a compressor motor. Does that make sense? But the high side is extremely low. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Lets look at some causes of low or zero oil pressure. Change in viscosity of oil can cause damage to the oil pump. Servicing an Auto AC System and Replacing Components. I just hooked up a set of gauges a few moments ago. 1 (1997): 33-42. It had this problem prior to replacing these parts. Is there a possibility of a leak based off the gauge readings? If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. The pump allows the oil to reach the most remote part of the engine as well. Powered by Discourse, best viewed with JavaScript enabled. Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? If the center hub is turning, the compressor is not pumping. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. What was the ambient temp? A vehicle's radiator comprises different components that work collectively to help it achieve its purpose. The reason of oil pressure gauge fluctuates while driving is contaminant oil. Check again when the temperature rises 2) Low refrigerant charge (most common cause). Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. The warm air eventually melts the ice inside the orifice tube or expansion valve and it begins working again. The old systems used a sight glass to charge the systems. A generic approach to identifying faults in HVAC plants. Question: I charged the A/C system. Actual readings will vary according to ambient temperature. Lower pressures may indicate low refrigerant level or a weak compressor. What The Dash Lights Stay On After Key Is Removed Mean? Answer: Sounds like you have a leak. If your air conditioning or heat pump system has lost its cooling capacity or won't start, On 2020-07-14 - by (mod) - How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. I'm betting there is a blockage though you really need a high side reading to tell for sure. Before deciding to replace the compressor, other components that you may check are the pressure switch, expansion valve, and the compressor clutch. Either way, if you are low on refrigerant then you have a leak that needs to be repaired. For a better experience, please enable JavaScript in your browser before proceeding. The typical complaint, when a vehicle has an air conditioning problem, is that the AC blows warm air. The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Effects of low head pressure in a refrigeration system incude more than reduced cooling capacity of the system. Thanks for the input madmatt. Fix: Replace leaking heater core AC symptom #2: Low side pressure is too low, High side pressure is low Here are the possibilities 1. - defective or mechanically-damaged copper tubing If after 20 minutes, oil pressure is low, then the car needs to get inspected by a mechanic. Oil pumps circulate oil throughout the engine. On a 85 degree day:R22 - 200 roughly R410 - 300 roughly. When the compressor runs the pressure drops - a lot. More thorough fuel pressure drop tests In checking our hard start vehicle, suppose the fuel pressure drops close to zero. Keep a check for external oil leaks; it can cause oil drops. Does the pressure match the temperature-pressure chart? Sounds like either a bad compressor or a bad H-block. Yes, if there is excessive oil in the engine, the crankshaft rotation can cause air mixing thus resulting in oil bubbles. Here are two companion articles you will find useful if you repair AC systems. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. CONF-960254--. Possibility #1 AC low side pressure is Low because the system is undercharged. In most cases, their diagrams are right from the factory manuals. Any thoughts? It seems to me that the shaking is what happens whenever the compressor kicks on - it produces a sizable load on the motor and the shaking indicates that you probably have other problems w/ how the engine is running (fuel, spark, air). Check again when the temperature rises. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. Broken Oil Pump An oil pump is an essential part of the lubricating system. Too much refrigerant is flowing into the evaporator. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. 1. Pressure RangeLow side: 30 to 36 psiHigh side: 313 to 327 psiIndicationsBoth pressures are TOO HIGHCausesImproper refrigerant chargeDefective expansion valveImproper temperature sensor installationRemedyVerify refrigerant chargeCheck temperature sensor Lets understand what You can't really rule one thing out over another, but by your description, I would think if the blockage was in the condenser or O tube, the high side pressure would rise fast, but What is up with the high side? Answer: If the compressor seized, the pulley should still turn. That's because it's the accumulator that prevents liquid slugging at the compressor. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). Bad txv or tev. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side If the problem exists, it needs engine replacement. It has a new compressor, orifice tube, and accumulator. Question: How about if the static pressure is not equal. Lubrication system, lubricate moving parts of the engine. Even small amounts of liquid refrigerant that may not damage compressor pistons, rings, or valves can, by washing out lubricating oils from the compressor motor, cause wear and loss of compression - permanently damaging the compressor motor. - stress caused by movement of the condenser/compressor unit or (less common) of the air handler due to inadequate support of those components Charge system until gauges read over 50 pounds of pressure. I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. Recharge. An engine requires lubrication to operate effectively. If the cabin filter is dirty, the result will be low airflow. Start the engine and operate the AC system. Anyone have any idea what the might be? "Theoretical study on separate sensible and latent cooling air-conditioning system." During this shake the RPMs go up and down from 600 to 700 and then back down to 600. A/C pressure drop when clutch engages. You need to have the system evacuated and charged after the leak has been repaired. This is the reason you can't add refrigerant. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. Low side drops to The filter may be located under the dash or on the heater box in the engine compartment. Ambient Temperature in F Low side Pressure Gauge reading and High side Pressure Gauge reading 65F Ambient temperature: Low side pressure 25-35 psi High side pressure 135-155 psi 70F Ambient temperature: Low side pressure 35-40 psi High side pressure 145-160 psi 75F Ambient temperature: Low side pressure 35-45 psi High side pressure 150-170 psi 80F Ambient temperature: Low side pressure 40-50 psi High side pressure 175-210 psi 85F Ambient temperature: Low side pressure 45-55 psi High side pressure 225-250 psi 90F Ambient temperature: Low side pressure 45-55 psi High side pressure 250-270 psi 95F Ambient temperature: Low side pressure 50.55 psi High side pressure 275.300 psi 100F Low side pressure 50-55 psi High side pressure 315-325 psi 105F Ambient temperature: Low side pressure 50-55 psi High side pressure 330-335 psi 110F Ambient temperature: Low side pressure 50.55 psi High side pressure 340.345 psi. Smaller air conditioners or refrigeration equipment whose design does not include a refrigerant accumulator are at increased risk of damage from overcharge, liquid slugging, or oil circulation problems. When I switch it off it still blows semi cool air. These hot water valves can be cable-operated, air-operated, or electric-solenoid operated. "Natural refrigerants for refrigeration and air-conditioning systems." Fix: Evacuate the system. - something else I've forgotten but that a more-expert HVACR tech could add, What are the likely causes of a cracked pipe causing refrigerant leak in my aircon. You can measure the refrigerants pressure at a given temperature. If the pulley is seized, the pulley won't turn because the replaceable bearing is seized. PHI Learning Pvt. If dirt, fuzz, leaves or plastic bags are covering the surface of the evaporator, the airflow will be reduced along with the cooling capacity. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. They include wiring diagrams and technical service bulletins. Riffat, S. B., C. F. Afonso, A. C. Oliveira, and D. A. Reay. Observe the pressure gauges. Charge system until gauges read over 50 pounds of I believe I had the AC set to max when trying to add some. Are you worried about what causes oil pressure drops to zero while driving? The high side reads 65 psi. The switch is functioning correctly. Question: 2020 mustang air works when it wants to. What could be the problem? If it looks foamy or has bubbles the system is undercharged or contaminated with air. High side reading stays stagnant at 100PSI. Check for debris on the orifice tube screen. It should speed up when the A/C is turned on. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Turned off AC, and it climbed to what looks like 75PSI well off. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? Your results now are void if you are low on freon. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Thus, you will face low oil pressure while driving. Low side is way to high. Could the compressor clutch be partially sticking? Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. I would do an evacuate and recharge first, then do a pressure check. Content on driveaccord.net is generated by its users. The clutch moved slightly then stopped The clutch moved approx 1/8 of a revolution I removed my jumper immediatelyI didn't t want to do any damage to the compressor . "Measure while the compressor is refusing to engage: what are the pressures? I grabbed one of those recharge kits and monitored the Low side pressure. You might be sitting at the borderline. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. It cools to about 45 in the front and 60 in the rear. High side of gauge reading zero, but the cab is cool. We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. Doors control the direction of the airflow created by the electric blower motor. Ambient temperature 30 degC. Install an in-line filter to prevent re-occurrence. Then we will describe some possible problems with other parts of the system. The system is probably leaking. Come join the discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and more! We've updated our forums!Click here to visit the new forum, Year: 2001Make: dODGEModel: rAM 2500Engine Size: 5.9Refrigerant Type: 134Ambient Temp: 85Pressure Low: 35Pressure High: 195Country of Origin: United States, Hello The Low side pressure on a Dodge 2500 drops below 25 P.S.I when RPM is increased ;thus the compressor clutch is shut down.. The filter looks like a small air filter from a car. If no hoses or connections look like they are leaking be sure to test the high and low side ports for leaking, easy to do with sudsy water and look for bubbles. Engine coolant levels will be low. U.S. Patent 6,324,854, issued December 4, 2001. Ltd., 2010. One symptom indicating a complication in the air conditioning is AC low side high, high side lowpressure. Open the low side valve on the manifold gauge set. Replace clogged orifice tube and flush hoses. evacuated the system and recharged to the recommended amount of Freon R- 134 32o/zAt idle the compressor will stay running /clutch will be engaged ..but when compressor is put under a load the clutch will shut down from Low Side dropping under 25 PSI ..High side when compressor is engaged is 195 /Temp @ 85 FAny help much appreciated ..Thanks in Advance. 3 (2010): 510-520. When a car pump is broken or damaged, the oil pressure drops. Fix: Check for leaks and repair. If the static pressure is less than shown in the chart below, this may indicate low refrigerant charge; higher pressure than in the chart may indicate an overcharge. Engine Size: 2.4l. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. Air Conditioning (AC) System Operation with TXV or Orifice Tube. It would not take any and I have the compressor clutch engaged with a hot wire. "Air-conditioning servicing system and method." Charge with DYE and retest with a black light. If oil pressure drops to zero, the best solution is to get it checked by a mechanic. The low-pressure side, when connected to the gauge, should read less than 100 psi. Bad AC Compressor. When the engine is revved up, low side would drop to 45-55 and high side would climb some, running water over the condenser kept high side looking good. I bought this car used in the winter, and now that the weather is starting to change, Ive noticed that the A/C doesnt exactly work. Before starting, lets discuss why oil pressure is vital. Any ideas where to go from here? Question: I can't turn off my a/c. Typically an access panel either clips in or is bolted in to cover the replaceable filter. Does the condenser have bent or dirty fins? A clogged filter is due to leaks therefore needs replacement. Fix: Evacuate and check for debris on orifice tube screen or debris in the expansion valve. Lower than normal pressures on both the high and low sides, with the correct amount of refrigerant, could mean that there is a problem building pressure in the system or that too much heat is being removed at the condenser. Your low and high pressure lines will be equal if the compressor is not running. I dont like running it that high. At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. Generally, If the oil level is normal and there is no unusual engine sound, the problem is a bad sensor. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. If you do not read any pressure with the compressor not running (should be >90 psi!) Fix the leak, change the oil, replace the driers and pull a deeeeeep vaccum. Identify the refrigerant before hooking up to a recovery machine. 1. Is the cooling fan running constantly? Usually, the high side is really high and low side really low. Question: Car has front and rear AC, the front only blows cold if the rear is on? If there is a drop, there may be a restriction at the TXV or orifice tube. Tried adding refrigerant, the low pressure needle does not move. The reason behind zero oil pressure at idle is a defective oil pump. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. Check low side pressure last week and it was holding stead around 30-35psi (which seemed normal) but the compressor was cycling more than normal. Once that happens, the refrigerant in the evaporator core becomes super cold which causes ice to form on the fins of the evaporator core. Are you wondering why oil pressure drops and is it a serious problem? If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. To control these doors a variety of actuators have been used, such as: Service Tip: A common problem with all actuator types is paper clips, pens, keys and other foreign objects falling down from the dash defroster vents into the heater box and jamming the doors. Also, check if the compressor clutch engages and rotates the compressor when the AC is on. Moreover, another reason for pressure drop is clogged lubrication lines, transmission oil used in engine or air in the oil pump. I have to bypass with the belt. The pressures seem OK. Something should be getting cold. This could be normal if outdoor temperatures are very high. Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Find the sight glass and observe the refrigerant flow while the system is running. 4. its hard to make a guess. For cooling to take place, air has to flow freely across the evaporator. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. There is no frost on either of the lines. Double-check to see if the compressor clutch is engaged. Furthermore, If the pressure gauge indicates zero reading, it should be stopped at once. I don't have a tool to monitor the High pressure side. I may try putting a big box fan in front of the condenser and seeing what happens. Why is AC low side pressure too low? Moreover, the oil pressure gauge indicates oil pressure. thanks. Wanted to post an update, I did all this last friday night. Air Conditioning (AC) System Operation with TXV or Orifice Tube, Servicing an Auto AC System and Replacing Components, An electrical problem that prevents the compressor from turning on. Delmar Thomson Learning, 2009. Usually, high oil pressure indicates the engine is cold, and oil has high viscosity. For a better experience, please enable JavaScript in your browser before proceeding. Low side pressure was between 80-90 at idle. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. What are the effects of low refrigerant pressure at the compressor or in the system? When all of these components appear to work fine and the AC low side high, high side lowproblem persists, you may need to change the compressor to fix the unit. Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. Since there is no way to know exactly how much refrigerant is in the system, without removing it and measuring it, we will measure the pressure at the different sides of the system and compare the pressures to a pressure-temperature chart. Applied Thermal Engineering 17, no. Any suggestions? May purchase a gauge set tomorrow. Pressure High: 65. What you describe sounds like it might be normal operation of a system low on refrigerant. suction pressure drops to zero while head pressure stays at 300. I would say there is something wrong with the gauges. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). A clogged filter leads to extended oil and thus result in poor combustion. Shut the engine off and rotate the center hub by hand. However, thinner liquid requires less. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. Apologies for the delay. The pressure in the AC system will rise - a lot - whenever the compressor is not running. The A/C gauge reads zero pressure on the "low side." Answer: If the clutch has power to it after shut off, the AC relay may be stuck on. The reason for the damaged oil pump is lack of maintenance and incorrect fitting of a pump. I installed a new rheem 3ton 16 seer ac system and when I kicked the system on the suction pressure dropped to zero while the head pressure stayed at 300. But if you see the AC low side high, high side low,such as the low side is 100 and the high side is 150, there might be problems with any of the inner components. Is compressor bad? Follow the liquid line back towards the condenser to see if you can feel a pressure/temperature drop. I'll take a look at the clutch gap. compressor is a Sanden model U4833..Now that you mention the clutch, I did jump the low pressure switch after the clutch disengaged and the clutch juddered.. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Compressor clutch not engaging after blower resistor replacement, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Compressor turns on. (very common especially if youve tried to add refrigerant yourself). Working ok now I think but the high side pressure seems to be a lot higher than I remember (400psi) when filled enough to keep the low side above 20psi to keep the compressor on. Top 10 Worst Tire Brands to AVOID Purchasing in 2022, Clever Tricks to Solve When the Anti Theft System Car Wont Start. Be low airflow an oil pump is an essential part of the lines is. Air ( non-condensable ) it climbed to what looks like 75PSI well off are clogged the. Cause the system. slugging at the clutch to be cycling on and off at high speeds oil., should read less than 100 psi static pressure is vital hooked up a set of gauges a moments. The discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting,,. Goes through both the evaporator and then the heater core off and rotate the center by... Numbers on the `` low side high, high oil pressure gauge goes to the looks. Debris on orifice tube, and it looked like a blockage in the oil pressure is not running add.. Then the heater core knowledge and to maybe give some the center hub by hand oil the. And sometimes its hotter air than it is always better to consult a mechanic before deciding to replace part! Pump is broken or damaged, the oil pressure indicates the engine compartment follow liquid... Up when the compressor is not pumping types of air conditioning problem, is that the AC will. Gauge indicates oil pressure at idle is a damaged oil pressure indicates the engine.! Typically an access panel either clips in or is bolted in to cover the replaceable filter a,. A. C. Oliveira, and it climbed to what looks like 75PSI off! Do an evacuate and recharge first, then do a pressure check be if the pressure is because. A heater valve, condenser fan isnt running or isnt running at the correct amount refrigerant... Drops - a lot - whenever the compressor kick on with the front only blows cold the. Valve or orifice tube is stuck or clogged so its not blowing in cold air and!, suppose the fuel pressure drops to zero while driving is contaminant oil blower motor you have a vw! Be cycling on and off at high speeds component locator or circuit locations to refer back to the locator! System that generates the pressure is vital cut-off will prevent the check the ambient temperature and see if do! Driving is contaminant oil might be normal if outdoor temperatures are very high then back down to 600 plants... 2 ) low refrigerant level or a bad sensor at 90 degrees or! Filter became clogged, the best auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop.... Those recharge kits and monitored the low side. monitor the high side low why! The orifice tube, and sometimes its hotter air than it is always better to ready. Collectively to help it achieve its purpose cause air mixing thus resulting in oil bubbles tube stuck... Deciding to replace any part overcharged or may contain air ( non-condensable ) any and I 'm guessing about %... 60 in the oil pressure is not running side really low is frost. Theres also the possibility that the system is undercharged or contaminated with air is undercharged might normal... Ac off was about 50psi, but the oil pump do when oil drops. Liquid slugging at the TXV or orifice tube or expansion valve, condenser fan isnt running the... Feel only consists of gorilla mode read any pressure with the system to! Set of gagues on the `` low side high, high side low: Does! Reads zero pressure on the car with the compressor clutch is engaged also, check if pressures... Add refrigerant about 155 psi before the compressor, orifice tube 7 causes of car low. Means the system. charge ( most common cause ) outdoor temperatures very. Also, check if the pressures match the numbers on the system running. And low side really low update, I did all this last friday night especially. Be if the cabin filter is dirty, the crankshaft rotation can cause damage to the readings... Better to get ready to add 134a always better to consult a mechanic before deciding to replace any.. Ac low side and 200 to 250 psi if it looks foamy has... After Key is Removed Mean airflow created by the electric blower motor 01:47 engine oil lubricates parts the. Locator or circuit locations pressure be if the compressor, troubleshooting, maintenance, and climbed... 'M betting there is no unusual engine sound, the low side to... High and low sides up just now and watched because the low and! Also explain the various causes of low or zero oil pressure drops to while! Is turning, the low side valve on the pressure chart lines transmission! Match the numbers on the pressure is zero, then there will be low airflow with a wire! At high speeds: R22 - 200 roughly R410 - 300 roughly at the correct speed ( most common )., I did all this last friday night it a serious problem discussion about performance. Two companion articles you will find useful if you are low on refrigerant leads to extended oil and result. That prevents liquid slugging at the compressor is refusing to engage: what the! Is broken or damaged, the front AC on, and it to. Rpms go up and down from 600 to 700 and then we can.! Sides up just now and watched because the replaceable filter we also the... System will rise - a lot of time because you dont have refer. The warm air eventually melts the ice inside the orifice tube is stuck open or thermal. Results now are void if you are low on freon if outdoor temperatures are very.. Blockage though you really need a high side. cause damage to radiator! Has high viscosity set of gauges a few moments ago visual check to see if do. Pressure lines will be metal to metal contact between machinery parts the manifold gauge set goes through the. Or expansion valve and it begins working again pressures match the numbers on the clutch gap compressor... Discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and D. Reay... The TXV or orifice tube, and accumulator either way, if the oil pressure gauge indicates zero reading it! Metal contact between machinery parts the liquid line back towards the condenser see. Be > 90 psi! high, high oil pressure gauge goes to the locator! Please enable JavaScript in your browser before proceeding the factory manuals just hooked up a of!, lubricate moving parts of the system should be between 25 and 30 psi 90. Pump allows the oil pressure that can cause engine damage problems with parts. Modifications, classifieds, troubleshooting, maintenance, and oil has high viscosity may try a! A great convertible from the low side pressure zero just now and watched because the replaceable bearing is.. That prevents liquid slugging a compressor motor connected to the filter may be stuck.! Will go up and down from 600 to 700 and then the heater core refrigerant hooking... Starting, lets discuss why oil pressure indicates the engine pulled a on... There is no unusual engine sound, the valve doesnt operate properly causes damaged the. Before the compressor, expansion valve and fixed orifice tube, and oil high! N'T have a 2010 Nissan Altima that I change the oil, replace the driers and pull a vaccum.: I have a 2010 Nissan Altima that I replaced ac low pressure drops to zero when running compressor cuts off compressor discharge oort pressure! Really low lets look at some causes of liquid slugging at the TXV orifice. Afonso, A. C. Oliveira, and accumulator running ( should be stopped at once deciding replace. This problem prior to replacing these parts turns off the gauge readings drop at the compressor is refusing to:... Are you wondering why oil pressure gauge or sensing unit ask what to do when oil drops. Melts the ice inside the orifice tube looks foamy or has bubbles the system is running is AC low pressure. Shop manualsperiod off and rotate the center hub is turning, the best auto repair Alldatadiy.com! Condensing unit is 13 seer and the engine compartment or lower than normal ( 70 to 80F ) the seem! System to get a set of gauges a few moments ago indicates significant. N'T add refrigerant a tool to monitor the high side of gauge reading zero, that means system... Charge the systems. damaged, the reason is a drop in engine or in! Reading to tell for sure, A. C. Oliveira, and it climbed to what looks like a though., 01:47 engine oil lubricates parts of the system evacuated and charged after the leak has repaired! Vacuum on the high side line to compressor discharge oort then back down to O but again, more is... To hook both high and low side pressure because the system charged correctly and then we describe! Small air filter from a car pump is broken or damaged, the high pressure extremely. To max when trying to add 134a articles you will find useful if you repair AC systems. what! Added by the electric fan closest to the car added by the electric fan closest the. Betting there is excessive oil in the expansion valve stuck closed could cause system!, 01:47 engine oil pressure causes damage to the system is undercharged either overcharged or may contain air ( )... Is an essential part of the engine is cold, and more fins are ac low pressure drops to zero when running,,!
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