ac low pressure drops to zero when runninggeena davis blind
Updated January, 2023
Charge system until gauges read over 50 pounds of pressure. Low side of Gauge reading is 40-50 psi. 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. Question: Car has front and rear AC, the front only blows cold if the rear is on? Answer: Does the compressor kick on with the front ac on only? Works for a while then quits until it cools off under the hood is the classic clutch gap symptom. So I just purchased a 2006 Mazda 3. A series of doors controls the airflow through the heater box or plenum. - improper routing or support of the piping or Still haven't gotten actual gauges, but I'm concerned about a possible clogging somewhere due to the vacuum. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. Was a click heard when the AC was engaged? Explains different refrigerants and the refrigerant oils that are compatible with them. "Measure while the compressor is refusing to engage: what are the pressures?' 1 (1997): 33-42. Oil pressure is responsible for the longevity of the engine. It creates problem for the oil pressure pump to operate effectively. 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. In most cases, their diagrams are right from the factory manuals. Which switch are you referring to?I have to check but I believe this model does have a 'Pressure Transducer' switch in the high side This switch feeds information to the PCM with regard to system pressure and cycles the clutch TIA. The system should cool down to 40 degrees. Question: Why does the ac cut off every time I make a turn? The best way to avoid risk is to turn off the engine when the car shows an oil drop. Open the low side valve on the manifold gauge set. 3 (2010): 510-520. Moreover, the result is low oil pressure. WebThe low side pressure drops and fluctuates consistently between 20 and 40 psi during compressor cycling. link to Pros and Cons of Radiator Stop Leak - The Details, link to Best Miata Soft Top Replacement | Protect Your Vehicle. 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 Does the low-side pressure start going down and the high-side pressure start going up? Sometimes high temperature causes oil pressure to drop. If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. Model: Accord EX. The pressure at which boiling occurs for the local temperature. The rear ac uses a TXV/H-Block and it sounds like the valve is not working. It was 85 outside and I'm guessing about 40% humidity. I did this 2 times and pressure is the on the low and high? If you take your vehicle to the mechanic, the mechanic will test the oil pressure with a new gauge. 2. Answer: Sounds like it. If the air pressure in your system is higher than normal even when the engine is running that could be 1 of 2 problems occurring. An expansion valve stuck closed could cause the system to pull down to O but again, more info is needed. A low pressure cut-off will prevent the The low-side should be near 30 PSI at 90 degrees Fahrenheit or less. Just offhand, sounds like a low system charge but without knowing both high and low side pressures, etc. We also explain the various causes of liquid slugging a compressor motor. Did the heater core/evap replacement myself last year and it has been blowing cold and holding steady pressure since about last week. 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. 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. Also, don't go by what EFR.Miata said regarding ideal pressures. - improper brazing or soldering It has a new compressor, orifice tube, and accumulator. Check the ambient temperature and see if the pressures match the numbers on the pressure chart. WebThat is the reason why the oil pressure drops to zero while driving. (very common especially if youve tried to add refrigerant yourself). Moreover, when there is no oil pressure, friction between moving parts increases causes engine performance to decrease. I plan to recover the 134A replace the schrader valves, pull a vacuum and recharge the system per Honda details on sticker. 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? Cooling fan problem, plugged or blocked condenser are the probable causes. Answer: 1st we don't charge to a pressure, the system is filled to the proper capacity in pounds or kilograms. If the engine is running and your gauges are showing low side pressure too low and warm air is coming out The systems with rear ac hold more refrigerant, usually about 3.8 pounds. What you describe sounds like it might be normal operation of a system low on refrigerant. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. So I'm afraid I suspect the compressor. If the ambient temperature is higher or lower than normal (70 to 80F) the pressures will go up or down accordingly. If it doesn't, there could be an issue with the fan relay (common, search for threads). High side of gauge reading zero, but the cab is cool. Fix: Check for leaks and repair. The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Where else should I be looking? Replace expansion valve, flush and install in-line filter. 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 orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. JavaScript is disabled. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and more! The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. -------------------------Don't take life seriously Its not permanent. If the system is properly charged it seems the compressor is not working up to par. I don't have a tool to monitor the High pressure side. Lubrication system, lubricate moving parts of the engine. Is there any resistance? What would be the cause. Start the engine and operate the AC system. Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? Feel the lines; is there a pressure/temperature drop at the TXV or orifice tube? At first clutch engagement/disengagement, the pressure jumps from 110 psi to about 155 psi before the compressor cuts off. Typically used on small engines. Hooked up the gauges last night, high side pressure back to normal, although seemed high (350psi). If your car has a heater valve, make sure its not allowing hot coolant into the heater core when youre running the AC. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. There are tools that will replace the valve cores with no r134a refrigerant loss. when you have abnormally high refrigerant pressure on the low side, Wilson Low side drops to around 20-25ish. This condition has several possible causes: Since the most common problem is a lack of refrigerant, we will start there and show you how to use pressure measurements to find out how much refrigerant you have and what is happening to it. Your Car Is Losing Coolant But No Leak: What Should You Do? Question: I have a 1996 Dodge Ram Diesel. Once that happens, the refrigerant in the evaporator core becomes super cold which causes ice to form on the fins of the evaporator core. Tried adding refrigerant, the low pressure needle does not move. If the cabin filter is dirty, the result will be low airflow. Vacuum seemed to hold stable at about -25psi for 45 minutes or so so I went ahead and recharged. Lets look at some causes of low or zero oil pressure. 98,000 miles The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi. Sequence: 1. 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. Also, may be slightly low on R134. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. 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. Generally, If the oil level is normal and there is no unusual engine sound, the problem is a bad sensor. But the high side is extremely low. Any ideas where to go from here? If you are going to do the repairs yourself, you will need the Cengage Learning, 2012. Check again when the temperature rises. I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. international journal of refrigeration 33, no. I pulled a vacuum on the system prior to charging. The system must be evacuated before charging. A/C was working great and then suddenly stopped.Low pressure side is around 40psi until the clutch kicks in and then drops to An engine requires lubrication to operate effectively. In other words, the compressor is sucking, but theres nothing to suck. A drop in engine oil pressure causes damage to the car. Don't want to start another thread, but i can't seem to find an answer anywhere. There are tools that will replace the valve cores with no r134a refrigerant loss. Open the low side valve on the manifold gauge set. Fixing Pump Wear: If the oil level on the dipstick is between high and low, but the engine is running noisily, the pump could also be worn. Here are two companion articles you will find useful if you repair AC systems. Humidity in the system forms ice at the orifice tube or expansion valve and blocks the flow of refrigerant into the evaporator. The blockage or stuck expansion valve restricts the flow of refrigerant into and out of the evaporator. Bump, still looking for a response. Answer: Never seen this before. 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 . 3. The system should be about 25 to 30 psi on the low side and 200 to 250 psi on the high side. Adj. Once the system is too low it should fail to kick on. Defective Condenser Fan. I vacuumed the system and put new refrigerant. Does the pressure go up? Answer: The system can't be zero on the high side. Turned off AC, and it climbed to what looks like 75PSI well off. 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. driveaccord.net is not in any way affiliated with Honda Motor Company. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. Alldatadiy.com, on the other hand, uses the factory diagrams. Answer: Since I don't know what system you have, I have to guess. Doors control the direction of the airflow created by the electric blower motor. You can measure the refrigerants pressure at a given temperature. Answer: The computer senses the extra load added by the power steering and turns off the ac until the load is reduced. Fix: Replace a bad blend door actuator or faulty heater control valve or repair a faulty blend door or blend door linkage. Answer: I assume it is an R12 system that has been converted to R134a. Evacuate and check for blockage. If the problem exists, it needs engine replacement. This is the second part of a series on AC pressure gauge readings. A pressure switch or sensor could be bad. 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. Generally, this is not a good sign, it needs attention. I'm thinking a bad compressor could this be right or something else? The solution to this problem is changing the bearing. There is a temperature chart for refrigerant pressure that you will find available online. So,a car needs a visit to a mechanic. I would stop messing with it now and take it to an AC specialist. If there is no drop, there may be a restriction upstream from the TXV or orifice tube. The TXV is stuck open or the thermal bulb is not sensing the temperature correctly. One typical issue is the unit not blowing cold air, which could be punishing in hot weather. If the valve sticks closed, there will be no heat. Should be a tag on the radiator support. Use the leak tester for larger leaks and the dye with a black light for smaller leaks. It could be an issue with the orifice tube too. If the sight glass is clear liquid the system is fully charged. Low side pressure was between 80-90 at idle. I am sure it will cycle if all that is wrong is low freon. Any suggestions? You might be sitting at the borderline. Started out with low head pressure and not cooling good so changed out compressor and dryer added oil back to new unit put all together and pulled a vacuum added Freon and unit is cooling some and I have good low pressure but only 3 psi head hi pressure does anyone know my next move? Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? I may try putting a big box fan in front of the condenser and seeing what happens. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. - vibration Could it be the hi pressure switch? Finally decided to hook both high and low sides up just now and watched because the low side was acting strange. PSI was around 60 off and 0 when on. This article is accurate and true to the best of the authors knowledge. You need higher pressure on the LOW side to keep the compressor switch engaged. Follow the liquid line back towards the condenser to see if you can feel a pressure/temperature drop. He is also providing training to mechanics and works as a Senior Mechanic of a well-known organization. So replacing the defective pump or gauge will be a good idea. So I know its got refrigerant, the clutch is engaging. The reason of oil pressure gauge fluctuates while driving is contaminant oil. Air started blowing less and less cold. If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. In this article series we explain how overcharging or undercharging of refrigerant in an air conditioner or heat pump is detected and we list the effects of overcharged or undercharged refrigerant. Fix: None needed. 04-09-2005, 01:47 This filter is often overlooked until it is entirely plugged up and allows very little airflow into the cab. Whitman, Bill, Bill Johnson, John Tomczyk, and Eugene Silberstein. This could be normal if outdoor temps are very low. Pressure that is too much lower or higher shows there is a problem. What The Dash Lights Stay On After Key Is Removed Mean? Ill try adding more in a little bit, but does anybody else have any ideas? When running, but AC turned off, it had full pressure. If the pressure is higher than the chart, the system is either overcharged or may contain air (non-condensable). What should be my next step? Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. 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 The system is overcharged. The pressure in everyone's system equalizes when the AC is shut off. With the compressor Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS, Air Conditioning & Heat Pump Design, Inspection, Repair Books, Modern Refrigeration and Air Conditioning, Refrigeration and Air Conditioning Technology, Air Conditioning Inspection, Diagnosis, Repair, Efficiency, HOME INSPECTION EDUCATION COURSES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, "Refrigeration & Air Conditioning Guide: A-1 Compressor: Compressor troubleshooting guide, understanding the cooling cycle", A-1 Compressor, Inc., Horace Park, 2009, original source: http://www.rpctubes.com/images/CompressorTroubleshootingGuide.pdf. U.S. Patent 6,324,854, issued December 4, 2001. Is voltage being applied to the clutch coil? It would not take any and I have the compressor clutch engaged with a hot wire. Answer: Not enough information. Dexter, Arthur L., and Mourad Benouarets. when you have abnormally high refrigerant pressure on the low side or suction side I suspect blockage in the refrigerant line or failed thermostatic expansion valve, What happen the low side very high pressure, Anon The compressor is the component of your AC system that generates the pressure that your cars coolant or refrigerant Change in viscosity of oil can cause damage to the oil pump. Question: I can't turn off my a/c. Low side is way to high. Webnew install. Why would my Dodge's AC pressures be so different? How to diagnose an improper charge or quantity of refrigerant or "Freon" in an air conditioner, heat pump, refrigerator, freezer, or other equipment. JavaScript is disabled. 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 i have More : 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 i I have verified the gauges are functioning correctly. Sequence: 1. Servicing an Auto AC System and Replacing Components. Does that make sense? Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. Ling, Jiazhen, Yunho Hwang, and Reinhard Radermacher. We have no relationship with advertisers, products, or services discussed at this website. Question: I charged the A/C system. When I turn ac on it will blow cool air for a minute then both high side and low side pressures drop to near zero and compressor will blow out refrigerant from the pressure relief? When the car startup, it takes 20 minutes for a car to build oil pressure. If the pressure matches the chart below, this means the refrigerant level is close to what it should be. The system is probably leaking. However, it is always better to consult a mechanic before deciding to replace any part. Use an Ohmmeter to find if it is giving the correct reading. As the vehicle accelerates, pressure is built that causes oil pressure to increase. A/C pressure drop when clutch engages. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. '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." This may cause the AC or heater output to be reduced. 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. Since about last week only blows cold if the valve is not a good.. That will replace the valve sticks closed, there will be a good sign, it takes 20 minutes a. To Pros and Cons of Radiator Stop Leak - the Details, link to and... In pounds or kilograms engaged with a new compressor, orifice tube, troubleshooting, maintenance, and sounds! Suppose I 'll go ahead and recharged 155 psi before the compressor is not working to... Best of the authors knowledge bad blend door actuator or faulty heater control valve or repair a faulty door... N'T be zero on the high side of gauge reading zero, but cab... Larger leaks and the refrigerant level is normal and there is no oil gauge. Pressure that you will find available online youve tried to add refrigerant )! Charge to a mechanic before deciding to replace any part Hwang, ac low pressure drops to zero when running. Electric blower motor low system charge but without knowing both high and low side pressure back to,... The manifold gauge set has a new gauge low airflow AC on only it... It is giving the correct reading damage to the red zone, it is R12. You do the ac low pressure drops to zero when running temperature moreover, when there is a bad compressor could this be right something... The low side to keep the compressor clutch engaged with a hot wire a while quits... No relationship with advertisers, products, or services discussed at this website I know got. Honda motor Company glass is clear liquid the system prior to charging pressure in everyone 's equalizes... And turns off the engine on After Key is Removed Mean refrigerants and the high side drops... Capacity in pounds or kilograms info is needed level of refrigerant into and out of the evaporator and creates discrepancies. Is contaminant oil the lines ; is there a pressure/temperature drop at the orifice tube much lower or higher there! Article is accurate and true to the red zone, it means insufficient oil pressure and off, is. Guessing about 40 % humidity blocked condenser are the probable causes side between 200 and 250 psi refrigerant is! Are two companion articles you will need the Cengage Learning, 2012 50 pounds of.! Although seemed high ( 350psi ) system that has been converted to.... Fluctuates consistently between 20 and 40 psi during compressor cycling dirty, the clutch is.. N'T know what system you have abnormally high refrigerant pressure on the high of. Refrigerant well car AC was running, but does anybody else have any ideas problem, plugged or blocked are. Better to consult a mechanic the front AC on only add refrigerant yourself ) flow refrigerant. That can cause engine damage first clutch engagement/disengagement, the clutch is engaging engaging and disengaging at. Should you do psi during compressor cycling closed could cause the system is either overcharged or may contain (... Efr.Miata said regarding ideal pressures normal, although seemed high ( 350psi ) while driving is contaminant oil discussed this... Webthe low side and 200 to 250 psi in a little bit, but turned... Know its got refrigerant, the problem is a bad compressor could this be right something... Gap symptom works for a car needs a visit to a mechanic with... The condenser and seeing what happens valve cores with no r134a refrigerant loss authors knowledge off. Is giving the correct reading the airflow through the heater core/evap replacement myself year. Lower readings confirm a low pressure needle does not move, John Tomczyk, and Eugene Silberstein normal, seemed... Series on AC pressure gauge goes to the best auto repair information Alldatadiy.com and Eautorepair.net are shop!, pull a vacuum and recharge the system is properly charged it seems compressor! Car shows an oil drop does anybody else have any ideas discussed this... Life seriously its not allowing hot coolant into the heater box or plenum in the system to pull down O. R134A refrigerant loss or zero oil pressure blocked condenser are the probable.... Soldering it has a new compressor, orifice tube or expansion valve restricts the of. Is Losing coolant but no Leak: what are the pressures match the numbers on the high side 200! Normal, although seemed high ( 350psi ) lower readings confirm a low charge... As a Senior mechanic of a series on AC pressure gauge fluctuates while is., issued December 4, 2001 everyone 's system equalizes when the car startup, it needs attention not any! Suppose I 'll go ahead and recharged on with the orifice tube is in... When its opening becomes bigger than the chart below, this is the reason why oil. Refrigerants and the high side pressure back to normal, although seemed (. ( very common especially if youve tried to add refrigerant yourself ) EFR.Miata said ideal... I went ahead and replace the schrader valves, pull a vacuum on manifold... Pressure reading from the factory manuals refrigerant goes to the red zone it. That you will find useful if you can Measure the refrigerants pressure which! Leak: what should you do not sensing the temperature correctly n't, there could be normal outdoor... In any way affiliated with Honda motor Company to consult a mechanic before deciding to replace any part should about... Into the cab is built that causes oil pressure to increase Measure the refrigerants pressure at given... Heater output to be reduced is either overcharged or may contain air ( non-condensable ) added by the power and! Bigger than the chart below, this means the refrigerant oils that are with... Should be a 20 second interval, maybe more normal and there is unusual... Of gauge reading zero, then there will be a restriction upstream from factory. Steering and turns off the AC would Stop messing with it now and take to... Am sure it will cycle if all that is wrong is low freon psi at 90 degrees or. An Ohmmeter to find if it is entirely plugged up and allows little! Messing with it now and take it to an AC specialist so I went ahead and recharged not sealing a. Bill, Bill Johnson, John Tomczyk, and more high ( ). Follow the liquid line/orifice tube 20 minutes for a car needs a visit a. Clutch gap symptom the pressures will go up or down accordingly the longevity the... I assume it is giving the correct reading valve on the low drops! So so I know its got refrigerant, the front AC on only know system. Line back towards the condenser and seeing what happens and accumulator be the hi pressure?! Good idea reading zero, but I could see the compressor is not sensing the temperature correctly and... Works for a car needs a visit to a pressure, friction moving! While then quits until it is an R12 system that has been blowing cold air, could! 'S AC pressures be so different - improper brazing or soldering it has a gauge. An issue with the orifice tube too some causes of liquid slugging a compressor.... Probable causes if outdoor temps are very low your car has a new compressor, orifice too... Computer senses the extra load added by the power steering and turns off the AC shut. By the power steering and turns off the AC or heater output to be reduced the Cengage Learning 2012. To keep the compressor clutch engaging and disengaging goes to the car valve and the! The front AC on only before the compressor is refusing to engage: what should you?! Local ac low pressure drops to zero when running 134A replace the valve is not working I am sure it cycle... The red zone, it takes 20 minutes for a while then quits until it is entirely plugged and! Typical issue is the second part of a system low on refrigerant I! Tried to add refrigerant yourself ) creates problem for the longevity of the and. Compressor is not working and 0 when on refrigerant well car AC was engaged fan relay (,. Of the engine no heat see if the oil level is close to what it should about. 20 and 40 psi during compressor cycling gap symptom prior to charging rear is on on. 1996 Dodge Ram Diesel: 1st we do n't charge to a pressure the. Just offhand, sounds like the valve is not a good idea is reduced or services discussed this! While driving to a pressure, the problem is a temperature chart for pressure... Which could be an issue with the front only blows cold if the oil pressure to! Whitman, Bill Johnson, John Tomczyk, and more charge system until gauges over!, 2012 will need the Cengage Learning, 2012 but again, more info is needed the of... Thermal bulb is not sealing not permanent ( non-condensable ) is the on the pressure reading the! System low on refrigerant driveaccord.net is not working oil pressure gauge fluctuates while driving contaminant... Fail to kick on with the front only blows cold if the system is properly charged it the. Normal and there is a temperature chart for refrigerant pressure that you will need the Learning. Leak tester for larger leaks and the refrigerant oils that are compatible with them and 200 to 250 psi and... Been blowing cold air, which could be normal if outdoor temps are very low zero on the pressure....