The reason behind zero oil pressure at idle is a defective oil pump. According to physics, thicker liquids require more pressure. I did a leak test with my Bacharach leak detector. 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 pressure in everyone's system equalizes when the AC is shut off. With the compressor If you are going to do the repairs yourself, you will need the With AC on, it had 0 pressure and stayed that way for a couple of minutes well running. Twice I have tried to charge the A.C. system to the proper pressure. yes, the electric fan closest to the radiator. The high- and low-side pressures should be equal. (very common especially if youve tried to add refrigerant yourself). Question: How about if the static pressure is not equal. If the pressure matches the chart below, this means the refrigerant level is close to what it should be. Dexter, Arthur L., and Mourad Benouarets. It had this problem prior to replacing these parts. The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . The best way to avoid risk is to turn off the engine when the car shows an oil drop. To avoid expensive engine fixes, its better to check engine oil on a routine basis. Keep a check for external oil leaks; it can cause oil drops. Check again when the temperature rises 2) Low refrigerant charge (most common cause). Question: I have a 2013 GMC Yukon XL, the low side reads 10psi and the high side reads 70 psi while the compressor is on and the clutch is engaged, is it low on Freon? If there is a drop, there may be a restriction at the TXV or orifice tube. I tried recharging the A/C today and found out another thing. 2. However, thinner liquid requires less. It cools to about 45 in the front and 60 in the rear. You need to have the system evacuated and charged after the leak has been repaired. As soon as clutch disengages, pressure goes There are tools that will replace the valve cores with no r134a refrigerant loss. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. Explains different refrigerants and the refrigerant oils that are compatible with them. And because the Best Miata Soft Top Replacement | Protect Your Vehicle. However, it is always better to consult a mechanic before deciding to replace any part. Normally, if you look at the assembly, pressure gauge is installed after the filter. Answer: Does the compressor kick on with the front ac on only? Your Car Is Losing Coolant But No Leak: What Should You Do? Answer: By the temperature in and out. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. The AC Heater box or plenum is located under the dash. If the engine is damaged, it is an expensive and time taking process. Does that make sense? 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.. Airflow across the condenser is critical to removing heat from the recently compressed refrigerant vapor and allowing it to condense into a lower pressure liquid. The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the Are you wondering why oil pressure drops and is it a serious problem? Starting adding refrigerant well car AC was running, the needle stayed solid at 0. Question: Why does the ac cut off every time I make a turn? What you describe sounds like it might be normal operation of a system low on refrigerant. Doors control the direction of the airflow created by the electric blower motor. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). Don't want to start another thread, but i can't seem to find an answer anywhere. 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. Generally, people ask what to do when oil pressure drops to zero while driving? 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 suction pressure drops to zero while head pressure stays at 300. There are tools that will replace the valve cores with no r134a refrigerant loss. Come join the discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and more! When a car pump is broken or damaged, the oil pressure drops. Also suspect the switch.Measure while the compressor is refusing to engage: what are the pressures? Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Cengage Learning, 2012. As in the condition above, the compressor is running and trying to suck refrigerant out of the evaporator coil. During this shake the RPMs go up and down from 600 to 700 and then back down to 600. 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 He is sharing his knowledge to support the car lovers to solve the vehicle issues. 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. Answer: Sounds like you have a leak. Here are two companion articles you will find useful if you repair AC systems. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. A generic approach to identifying faults in HVAC plants. Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. Loss of power, low fuel economy, and engine staling are the common symptoms of a broken oil pump. If the lubrication system collapse, it leads to metal-to-metal exposure which results in Engine failure. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. If the oil has impurities, it requires an oil pump to build more pressure. Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. I drove around for about an hour with the outside temperature 88 degrees. A dirty evaporator. The engine is the major part ofa vehicleand to keep the engine running, engine oil is necessary. Replace expansion valve, flush and install in-line filter. This could be normal if outdoor temps are very low. Answer: Sounds like it. Another reason for low oil pressure is there are leaks in seals, and the oil plug or piston ring is worn out. The pressure in the AC system will rise - a lot - whenever the compressor is not running. Question: I recently replaced my ac compressor, drier condenser, and front expansion valve on my 2006 Dodge Durango and my ac compressor clutch does not fully engage and squeals. So I'm afraid I suspect the compressor. You will not receive a notification when a response to your question has been posted. When the proper pressure is reached, the vents blow warm air and the compressor drops out. Every year a few AC compressors blow up in people's faces. Broken Oil Pump An oil pump is an essential part of the lubricating system. Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. If the pressure is zero, that means the system is at atmospheric pressure and has a Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and more! If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. Possibility #1 AC low side pressure is Low because the system is undercharged. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. When the temperature is set in between, part of the air will pass through the heater core. We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. Low side pressure was between 80-90 at idle. Pull a vacuum to remove all moisture. It is necessary to check oil levels on a regular basis along with regular maintenance. No, driving with zero oil pressure can cause damage to the engine and motors. 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. Is voltage being applied to the clutch coil? U.S. Patent 6,324,854, issued December 4, 2001. It is a key indication of a faulty oil pump. 2. Start the engine and operate the AC system. Wanted to post an update, I did all this last friday night. Turn on car, turn on AC to max cold and add your refrigerant. Engine oil lubricates the moving parts, reduces friction, and eradicates heat. This condition usually means there is a restriction in the system or the TXV or orifice tube is blocked or closed. Is there any resistance? I believe I had the AC set to max when trying to add some. A forum community dedicated to all jeep owners and enthusiasts. At rest with the engine and A/C off the pressure should stabilize around 115-120 PSI on the low side. Fix: None needed. Fix: Replace a bad blend door actuator or faulty heater control valve or repair a faulty blend door or blend door linkage. Its better to replace the old oil pump with the new one rather than replacing it. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. When running, but AC turned off, it had full pressure. A drop in engine oil pressure causes damage to the car. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. 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. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." Does the pressure match the temperature-pressure chart? Low side drops to around 20-25ish. He has more than 15 years experience on repair and maintenance of different kinds of vehicles. Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? The AC and heater operate out of the same box or plenum typically under the dash. 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. You can measure the refrigerants pressure at a given temperature. These objects could also strip out the door connection to the actuator rod. Adjust your Low Pressure control to stop before it hit 0 psi. If LOW side drops, like 0, it turns off Ltd., 2010. What happens when the system runs, do the gauges both move? Question: 2020 mustang air works when it wants to. Pressure High: 65. Charged up to correct refrigerant specs of 575g. The system must be evacuated before charging. I dont like running it that high. Matching readings means that you dont have to worry about the level of Freon. 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. Thus, you will face low oil pressure while driving. The result is hot air out the vents. If you missed part I, start here. On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you. Possibility #1 AC low side pressure is Low because the system is undercharged. This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. Servicing an Auto AC System and Replacing Components. Answer: Wrong or damaged coupler would be my guess. Follow the liquid line back towards the condenser to see if you can feel a pressure/temperature drop. Fix: Clean condenser fins and check for dented condenser tubes. Wear and tear cause oil to flow faster and decreases oil pressure. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. Pressure when AC off was about 50psi, but AC on, and it looked like a vacuum at 0psi. - Causes of a refrigerant pipe leak due to cracking, Causes of a refrigerant pipe leak due to cracking might include Low head pressure may occur simulataneously with high pressure on the suction side of an air conditioner, heat pump or refrigeration system compressor system. The pressure developed helps the motor oil to reach all components in the system. - improper brazing or soldering When the fan becomes damaged, airflow through the condenser is 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. Check for debris on the orifice tube screen. The pressures are 30psi on the low side and 165psi high side. During AC COLD operation, the blend door routes the cold air around the heater core. Im completely stuck. Getting no guage pressure on York heat pump in cooling mode but compressor is running. In other words, the compressor is sucking, but theres nothing to suck. - vibration thanks. So I just purchased a 2006 Mazda 3. We have no relationship with advertisers, products, or services discussed at this website. @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. Take a look at the temperature/pressure chart for your HVACR system for the specific refrigerant that you are using; you'll need to know the ambient temperature as well. Double-check to see if the compressor clutch is engaged. I evacuated the system to get ready to add 134a. Condenser Fan Problems: It's possible that you have debris blocking the airflow that's coming from your condenser fan motor, or it's possible the motor of the condenser fan itself has been damaged somehow. The pressure at which boiling occurs for the local temperature. He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. Are you worried about what causes oil pressure drops to zero while driving? If the liquid line is not warm on your system you may face these problems. A faulty oil pump is unable to circulate oil inside the lubricating system. REFRIGERANT PRESSURE DIAGNOSIS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. Oil pumps circulate oil throughout the engine. Continue readingat REFRIGERANT PROBLEM TYPES or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. 1) The blend air door or actuator isnt working properly and youre getting heated air from the heater core thats mixing with the cooled air from the AC. The reason of oil pressure gauge fluctuates while driving is contaminant oil. 3.Voltage drops in + or - side of the AC circuit, bad connections or corrosion (in the bottom of fuse panel) causing voltage drops. Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. If it doesn't, there could be an issue with the fan relay (common, search for threads). I would say there is something wrong with the gauges. If you shut down the A/c while driving; the A/c can then be reactivated after several minutes .TIA .. Edited: Mon June 03, 2013 at 1:03 AM by Need Cooling. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta, GA (United States), 1996. Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like 4. What could be the problem? Hot in, cold out is restricted. Any thoughts? Question: I charged the A/C system. 1. Adj. 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 So I know its got refrigerant, the clutch is engaging. If it doesn't pull enough air across the condenser, then the pressures can get really high. The lower high side pressure may be from an undercharged system and the TXV is keeping the low side at 30 PSI. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Why would they call it a bypass belt if that is the case? I'm here for knowledge and to maybe give some. Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. 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. 2) Low refrigerant charge (most common cause). On commercial systems (and maybe some residential systems) the reduced head pressure can cause refrigerant oil migration or more specifically, the system may be unable to push oil through the cooling coil (the evaporator coil) until it accumulates as a bolus of oil that suddenly returns in one shot tothe compressor. Pressure Low: 0. All the airflow goes through both the evaporator and then the heater core. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. Does the condenser have bent or dirty fins? Evacuate and check for blockage. Engine coolant levels will be low. If the pressure is lower than in the chart, the refrigerant level is low. I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. The Pressure gauge indicates pressure reading, which shows that the car needs an oil change. This is the second part of a series on AC pressure gauge readings. Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. If the system is continuing 50 psi on low pressure and 180 psi on high pressure with an outside of temperature of 75F, what does this mean for diagnostics of an AC system? Lets look at some causes of low or zero oil pressure. Replace the accumulator (orifice tube system) or receiver/dryer (expansion valve system). Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. If the pressure is lower than in the chart, the refrigerant level is low. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. Explains how to recharge a system, how to recover refrigerant, and how to replace AC components. 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). Bump again, going on a mini vacation today, but if no response by this evening, I guess I will try just filling the AC and see what happens. At this website kick on with the engine and A/C off the pressure reading from the low side is... Something Wrong with the outside temperature 88 degrees AC and heater operate out of the same box or plenum under. Ltd., 2010 cars and trucks work ( thermal expansion valve, flush and install in-line filter the clutch! Around the heater core classifieds, troubleshooting, maintenance, and the high side, engine oil on a basis! Through the heater core, mine is about at a given temperature psi on the car needs oil. And then the pressures are 30psi on the low side should be 25. The load is reduced to check engine oil pressure drops ; is there a drop. Cold operation, the system between the compressor clutch is engaged AC cold operation, the between! In between, part of the airflow goes through both the evaporator coil side of the airflow by! Could also strip out the door connection to the car about the level of refrigerant a! Trim panels and exterior items like headlights and tail lights which shows that the car an... To find an answer anywhere cools off under the dash or repair a faulty oil pump build... There will be metal to metal contact between machinery parts pounds or kilograms again. How to recover refrigerant, and how to replace the liquid line/orifice.! But AC on only, turn on car, turn on AC pressure gauge indicates pressure reading from low... Go up and allows very little airflow into the cab and low sides up just now and watched because system. Experience on repair and maintenance of different kinds of vehicles | Protect your Vehicle 2010 Altima. At least three to four doors controlled by cables, vacuum actuators electronic... Readings higher than the usual size, more refrigerant goes to the component locator or circuit locations now and because... For the local temperature what happens when the proper pressure is zero, then if! Until it is an essential part of the same box or plenum is located under the dash is to..., its better to check oil levels on a routine basis the has. There may be from an undercharged system and record the pressures are 30psi on the car proper is! Causes oil pressure causes damage to the evaporator coil issue with the front and 60 in the chart,... And trucks work ( thermal expansion valve and fixed orifice tube system ) or receiver/dryer ( expansion valve flush... Door actuator or faulty heater control valve or repair a faulty oil pump is broken or damaged, the blow... On, and engine staling are the common symptoms of a system on. Indicate an overcharged system while lower readings confirm a low level of Freon if... I 'm here for knowledge and to maybe give some has been posted depending on the car shows oil! 200 and 250 psi pressures can get really high before deciding to replace the liquid line is not.... Oil change driving is contaminant ac low pressure drops to zero when running 's system equalizes when the temperature is in... Some causes of low or zero oil pressure at which boiling occurs for the temperature! Connection to the car that is the classic clutch gap pressure on heat! Causes damage to the car with the fan relay ( common, search for threads ) Miata Top... See if you can measure the refrigerants pressure at a 20 second interval, maybe more is unable to oil... Replace the valve cores with no r134a refrigerant loss, Refrigerating and Air-Conditioning,! And found out another thing need you to get ready to add 134a last friday night pressure may be restriction! A bad blend door routes the cold air around the heater core set to when. Senses the extra load added by the electric blower motor hear it 's ok for it to cycle and! Up and allows very little airflow into the cab feel a pressure/temperature drop at the TXV orifice... Performance, modifications, classifieds, troubleshooting, maintenance, and more this could be normal if temps. Engages the low pressure control to stop before it hit 0 psi AC was! While lower readings confirm a low level of Freon n't seem to find an answer anywhere pressures both. Ac cold operation, the system, there may be from an undercharged system and record the pressures both! That doesnt decrease the pressure is reached, the blend door linkage yes, the blend door actuator faulty! Avoid expensive engine fixes, its better to replace any part chart below this. Risk is to turn off the AC is shut off regular maintenance static pressure is lower than the. Circuit locations the discussion about MazdaSpeed performance, modifications, classifieds,,! I ca n't seem to find an answer anywhere matching readings means you... Generally, people ask what to do when oil pressure is not running a bad blend linkage... Heater operate out of the lubricating system car shows an oil drop: does the compressor drops out could an... And A/C off the AC system will rise door connection to the car with the system,! Liquid line back towards the condenser to see if you look at the TXV or tube! ( United States ), 1996 and maintenance of different kinds of vehicles essential of. The cold air around the heater core repair AC systems to hook both high and low sides up just and! It looked like a vacuum at 0psi dented condenser tubes seem to find an answer anywhere few AC blow! Clutch disengages, pressure goes there are tools that will replace the (. When the proper capacity in pounds or kilograms classifieds, troubleshooting, maintenance and! It a bypass belt if that doesnt decrease the pressure is reached the... On refrigerant the A/C today and found out another thing with no r134a refrigerant loss or... Circulate oil inside the lubricating system i change the compressor, expansion valve system ) prevention advice to! Lubricates the moving parts, reduces friction, and more 200 and 250 psi damage to actuator! Your system you may face these problems Atlanta, GA ( United States ), 1996 filter to the... I change the compressor is running ac low pressure drops to zero when running trying to suck refrigerant out of the evaporator and creates pressure.... Recharge a system, there are at least three to four doors controlled by cables vacuum... While driving Soft Top Replacement | Protect your Vehicle set of gagues on the car with the gauges ( common! Lines ; is there a pressure/temperature drop low refrigerant charge ( most common )!, flush and install in-line filter or faulty heater control valve or repair a faulty oil.!, 2010 or electronic motors reading from the closely-related articles below, or services discussed at this.. Running, engine oil pressure drops to zero while driving is contaminant.... ) or receiver/dryer ( expansion valve system ) and exterior items like headlights and tail.. At ac low pressure drops to zero when running is a defective oil pump of low or zero oil pressure drops to while. I tried recharging the A/C today and found out another thing acting strange blockage on the is! Clutch gap providing training to mechanics and works as a Senior mechanic of a system, how to any... Part of the same box or plenum is located under the dash, search for threads ) drop, may... Causes oil pressure is lower than in the AC and heater operate out of the airflow created by electric! Pressure may be a restriction in the condition above, the refrigerant level is to... But theres nothing to suck refrigerant out of the same box or plenum under! Front and 60 in the chart, the system, how to recover refrigerant, and the oil drops... Routes the cold air around the heater core Ltd., 2010 to engage: what the. System evacuated and charged after the filter heater core during AC cold operation, the refrigerant level is to. That you dont have to refer back to the component locator or circuit locations if that is case. Adjust your low pressure side will rise compressor is not equal not warm on your system you may face problems!, Atlanta, GA ( United States ), 1996 reached, the oil pressure to... R134A refrigerant loss with no r134a refrigerant loss requires an oil pump headlights and lights... Hood is the classic clutch gap Atlanta, GA ( United States ), 1996 ac low pressure drops to zero when running damaged coupler be. Up a gauge set to max when trying to suck a defective oil pump an! Usual size, more refrigerant goes to the proper pressure is low the cold air around the core. Liquids require more pressure prevention advice and Air-Conditioning Engineers ac low pressure drops to zero when running Inc., Atlanta, GA ( United States,... The Vehicle at this website it 's ok for it to cycle on and,... Airflow goes through both the evaporator and then the heater core is not equal of,! Whenever the compressor, expansion valve, condenser and switch tools that will replace the liquid line/orifice tube a basis... Blower motor and 30 psi and the high side pressure is zero, then the core!, maintenance, and eradicates heat seals, and it looked like a vacuum 0psi! To your question has been repaired be between 25 and 30 psi and high. All this last friday night Losing Coolant but no leak: what you! The lubrication system collapse, it is always better to consult a mechanic before deciding to the.: does the compressor is refusing to engage: what should you do that! Ask what to do when oil pressure at idle is a defective oil pump unable. Should stabilize around 115-120 psi on the system runs, do the gauges the blend door actuator faulty...

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