These gauges are relatively accurate and an inexpensive way to measure the low side pressure in your system. My car is a 1997 chevrolet Camaro RS 3.8 litre. pressure It is completely normal for your vehicles compressor cycle to on and off. It cant hurt and may help you determine what caused this problem more quickly! Or What might be causing my AC not to cool when its 90+ outside but work when its 80 or below outside. Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicles condition and be able to make any appropriate recommendations. In fact, as soon as you turn your car AC off, you will notice that there are now two sources of airflow into and out of your cars cabin: direct outside air from the windows and airflow from outside through vents on the engine compartment. Pressures in your air conditioning system will vary significantly with as ambient temperature varies so those could also be high or low depending on what the temperature was when you made the measurements. Thanks for your question about your 2000 GMC Aerotech bus. When running high side is like 150-175psi low side is between 25-35psi. The best way to measure the high-pressure side of your system is to get the proper tools for a local auto parts store. They will not be equal IMMEDIATELY after turning the engine and AC off! High side seems a little low but low side seems normal. system aircon diagram pressure switch mg rv8 geoff insley source what course of action do you recommend next? This may not seem like an issue because most people drive their cars for less than 100 miles per day on average. Stumped as to why it wont take fluid and up the pressure. We recommend getting the system evacuated then adding refrigerant by weight. To get your system operating at top efficiency you need to first evacuate the system, then add the refrigerant. However the gauge always read on the red mark. You can also find Red Angel A/C Stop Leak & Conditioner at any of our partnering auto parts stores like: ac_pressure.jpg By Favor_of_God Licensed by Getty Imagines Original Link. Something metal. Not sure on vw but most of the cars ive done ac work on equalize around 50-60psi. 2021 - 2022 AutomotiveGuider.com All Rights Reserved. I am trying, most everything checks out except anything that requires a duty cycle meter to check. I can kick the compressor on with scan tool and after the pressure goes up a little I can use the a/c buttons until I turn the car off or the pressure drops on the sensor. Our recommendation would be to use Red Angel A/C Stop Leak and Conditioner (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak, then add refrigerant until your compressor starts running again. The most common causes of the problem youre having are either an overfilled system or a clog in your system. Now same problem 60psi low side 130psi high side? The Red Angel A/C Refrigerant Stop Leak would be able to treat a leaking evaporator. Its always best to tackle the problems whenever they occur, and it can be frustrating driving on a sunny day. If you have a high-pressure reading from your air conditioning system, there are two possible explanations. Try checking the high-side PSI to see if it is abnormal. Servicing an air conditioner can be very technical, and it might require a professionals touch with the right tools. Ok, I will give that a try, I figured i would go ahead and change out the wiring connector going to the pressure switch and then go from there. http://forums.tdiclub.com/showthread.php?t=242699. Based on your description of the loss of cooling, it sounds like youve got a leak in your system letting the new refrigerant you put in escape again. Just replaced fan clutch, compressor, accumulator, and orifice. Installed another compressor, documentation with compressor said if system was flushed, compressor had enough oil. If your condenser fan functions at very high pressure, it can damage the aluminum, then you begin to experience leakage from the evaporator coil. If your compressor isnt engaging and you have that reading then your system must be overfilled. It cant be used to tell if you have the correct charge. Your high side pressures sound about right based on the outside temperature assuming your compressor is engaging. What do you think?? This might lead to your AC not working at all or very weak. Any idea what might cause this? Volvo S40 1.8 2006. You can use either an electric or gas-powered machine to do so, whichever is easier for where you live in terms of cost and availability (although we recommend getting both). Check to make sure there are no blown fuses and that there are no wiring issues and then re-assess the situation. Static pressure readings only indicate when your system is empty or has refrigerant. Metal noise. What the heck happened? Welcome to rxmechanic.com. Thanks in advance. Any chance you could tell me which one I need for my application, what should pressure be 66 gto r6 comp. Please suggest me whats is perfect pressure keep on low side when ac charge. Once again, when the fan clutch kicks on pressures are normal. I need your guidance about my cars AC issue, if you dont mind. Make sure you dont get any water anywhere that carries freon, like into its pipes! All O rings have been replaced. This process can either be done online or by visiting close by shops. It sounds like youve got a slow leak in your air conditioning system since adding refrigerant helped it work for a few days. If you know the causes of the problem and how to fix them, you might not have to go to a mechanics shop for simple fixes. If the system has the correct amount of charge, wed suspect either air in the system or a faulty expansion valve. Read Also: How to Jump AC Compressor Clutch Correctly. In addition, overcharging can lead to too much humidity inside and cause short circuits without us noticing until later! Most new vehicles have electric fans in addition to the engine driven fan that come on when the compressor is cycling. It may seem like theres not much more than simply spraying on some gooey stuff, but those who know what they are doing will tell you otherwise. You might consider installing an auxiliary electric fan that comes on when you turn your air conditioning on to keep the pressures lower in your system. Use Red Angel A/C Stop Leak so seal the leak and keep your air conditioning system working properly. He loves writing about auto professional repair guides, DIY repair guides, and buyers guide. Thanks for your question about your 1995 Ford F150. I did let out quiet a bit. I checked some other 95 F150s stickers that also said 11 fl oz. rebuilt converted to r134 every thing else is new and made for r134. So I added 140cc of oil to new compressor #2, and installed. Thanks for your question about your 2014 Passat. It's called "Pressure/temperature saturation". On the high-pressure side of the system, a low pressure can also indicate that youve got a low refrigerant level or if the pressure is close to the same as it is on the low-pressure side it can confirm youre having compressor issues. You have to release this pressure somehow, but you should allow your mechanic to do that for you. As long as you are not losing more than about 1 lb of refrigerant a day, you would be a good candidate for the product. AC magnetic clutch fuse is OK. Pressure on high side 970kPa. Problem: 2001 BMW 330xi. The can of refrigerant you purchased from the auto parts store is pressurized so it can push the new refrigerant into the system. volvo ac pressure valve low refill pres check My 2007 Honda Civic was having cooling issues, so I bought a a/c refrigerant and topped it up. AutoZone also helps test your vehicles parts for free, e.g., your alternator, battery, voltage, and starter. Ive been looking into aux fans but also thinking maybe the fan clutch is no good even though its new. For a better experience, please enable JavaScript in your browser before proceeding. If your engine is overheated, the AC may not function when the car is not moving. Thanks for your question about your 2000 Chevy Silverado. Was the system overcharged with refrigerant? I have a 2007 Kia Sportage that blows warm air when at a stop light or drive through. The auto A/C is in good working order. Where else should I look into? The other thing we would recommend checking the wiring between the sensor and the HVAC module to see if there is anything that could be disturbing the signal which could cause the erratic or inaccurate readings. We recommend bringing the vehicle into an A/C specialist for possible repair. Would this extra oil cause this issue? Put manifold gauges on and here are the stats: Ambient Temp = 89 degrees (60% High humidity here South Florida). * Pulled driver side plastic console plate off to access expansion valve. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Should both be cool? They may have cut some other wires that shouldnt have been cut so I will pull that out and try. The compressor raises the pressure of the refrigerant to over 300 PSI and all the compression adds a lot of heat to the refrigerant so that is perfectly normal. I have a 2010 Ford Fusion and have been trying to figure out why the compressor wont kick on. It can also lead to AC system failure or damage to your AC condenser. I change the A/C canister, cause the valve to fill, was broken, so I bought a brand new one. This could have happened if you didnt fully evacuate your air conditioning system before you installed the new refrigerant and oil or it could be an indication that youve got some clogs somewhere in your system increasing pressure. I have a 2014 Nissan Altima. Thanks for your question about your 2012 F250. Then I let off and it showed 30 lbs. The orifice in the valve could be stuck and not adjusting to evaporator temperature. It came along with a pressure gauge for low port. Its also very possible that the condenser fans motor is faulty. high side of comp running around 300 psi and suction running about 40psi . If your compressor leaks freon from the O-ring seal or makes noises, it shows its time you replace the compressor. The tag calls for 4lbs and 8oz of refrigerant to feed both units during simultaneous running. If not, it will cause your car ac pressure to not equalizing. The low side should be reading at about 30 PSI. No, you shouldnt do this at all because you wont get the right reading. The most common cause for high compressor head pressure is clogging or contamination in one of the refrigeration lines. I drive a 2014 Chevy Silverado LT with a 5.3 L engine. After spending six years in the automotive workshop, he decided to impact his knowledge to people aside his domain, and he has achieved this by centering his Automotive writing skills on REPAIRS. You can try using this chart to see what pressures should be based on outside temperatures. You might try calling Ford to find out what the pressures in your system should be just to make sure they are higher than normal. I followed some DIY tips and assumed it was low on freon so I bought a AC Pro 20 oz can with a gauge on it. Those pressures are fine to run the system. Most cars in old model products were equipped with electronic modules that tell the vehicles AC compressor when to cycle on or off. This means that there is always some level of Car AC pressure when your car turns off! I have a 95 F150. HAVE YOU ANY LUCK WITH FIXING YOURS? My AC problem had resolved for few days after I had topped it up, but now it starts blowing hot air after I have drive the car for few minutes. Its remotely possible the valve is bad in your AC system so when you try to add refrigerant it closes off but thats very unlikely. If the system is overcharged frequently without enough room to depressurize, your AC system will stop functioning altogether. But comp is cycling on and off about every 50 to 60 sec. Hi, I have 2007 sentra and it stopped blowing cold air this summer. Thanks. When I hooked up my manifold gauges, the readings came as 72 psi on low side 125 psi on high side while the ambient temperature was around 80. Why Is My Dashboard Air Vents Not Working. A faulty condenser fan motor is also possible, and an aluminum evaporator coil is damaged due to high pressure from your systems blades. Unfortunately, this would usually indicate the expansion valve is failing or there is a blockage in the system. and while I was driving today (without the AC on Super hot weather) I listened a wear noise like it was like a Lawnmower not loud but I can hear it while I was driving Ill appreciate your help!!! I checked the low pressure and it always shows 100 psi even if the ac is switched on or off. Thank you, Nick. Thank you for asking about your Hyundai Elantra. When fixing your new compressor, make sure you tighten the mounting bolts evenly not to affect your ac compressor pressure or case. Havent changed it for like 3-4 years. HAVE YOU MEASURED THE ACTUAL TEMPERATURE COMING OUT OF THE VENTS? Thanks again for your question about your F150. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. In order to release this built-up air pressure inside our cars, we need someone who knows what theyre doing, like a mechanic. document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); Stay in touch with new products, promotions, free stuff and more! When the compressor shuts off or you turn your car off the pressures in the system will equalize between the high and low side so the low side pressure will read much higher. Poking a leaky hole in its containment vessel. Can you please help me why pressure in my sentra is 100psi and there is no cold air. There arent any specifications for temperatures of the refrigerant entering the condenser as long as the refrigerant is cooled to ambient temperature by the time it comes out, everything will work properly. What maybe the problem here? Since youve now added and removed refrigerant, the only way to make sure your system isnt overfilled would be to have the system completely evacuated then have the correct weight of refrigerant added. AutoMotive Guider is reader-supported. Could it be a faulty gauge. That's unfortunate, I still want to check the pressures to be sure though. If the refrigerant is topped off to the proper level, it more than likely would be a blocked condenser. But not the last 2 years. Can I put 45 psi or 50 and be safe ? document.getElementById( "ak_js_3" ).setAttribute( "value", ( new Date() ).getTime() ); Copyright 2020 | BlueDevil Products | All Rights Reserved | Warranty & Returns, http://store.gobdp.com/a-c-stop-leak-aerosol-00222/. recharging condenser The problem is at idle the discharge temp is 58 degrees at 75 degrees outside air temp. Time to take a look at the compressor/clutch? While fixing new seals for freon pipe, rub oil on them till they are properly lubricated and wrap a box with newspapers to reuse it later if desired- though this could also make reusing an old one more difficult! At 35 degrees Celsius, the low pressure gauge should read between 50-55 psi, and the high pressure gauge should read between 275-300 psi. Thank you for asking about your Buick Lesabre. I did have another question, when I replaced everything, the ac sticker on the truck says max oil is 11 fl oz and to use WSH-M1C231-B? Thanks for your question about your 2007 Honda Civic. A gauge set will show BOTH high side AND low side pressures to be EQUAL, when the engine, and therefore the compressor, are OFF! My compressor doesnt engage. When your ac pressure is higher or lower than it should be, even when your engine is off, it implies a few problems in your vehicles system. Save my name, email, and website in this browser for the next time I comment. HomeX virtual experts will assess your issue (for free!) When I try to check the low pressure there is no reading at all. Thank you ! Other reasons might be that your compressor clutch has rotation problems as intended, or maybe your condenser is blocked or dirty. It sounds as though the low-pressure switch may be faulty. When the temp goes down 27 or so Celsius blows hot and veey rare blows cold air. link to How to Clean Car AC Evaporator without Removing It? A rule of thumb is to. I have a 1970 Nova SS.and.replaced condenser Apparently theres a superheat type of compressor and a high pressure type of compressor. That's normal with the compressor off. Air conditioning systems are very delicate and can develop various issues, including high car ac pressure when off or fluctuations in pressure. Hello, I was just wondering if maybe you could help me. Most problems with your air conditioning system will require a vacuum, repair, and refill of the system. I followed directions to the letter and ran on max, compressor on, engine to normal temp, I checked the pressure was on the low side at 30 lb. High air conditioner pressure can be caused by a few different things, including an overcharged system. You can have dirt or debris accumulated in your system over time, and this debris blocks the airflow that comes through the condenser fan motor. I have only checked it multiple times within the last two weeks when ambient temperature is near 100 Fahrenheit. I am a co-founder at AutomotiveGuider.com. I replaced the switch with 2 different ones and its still doing the same thing. The system is charged with frion. Hello, I believe the compressor in my 2007 Mini Cooper may be failing but not 100% sure. The best solution is to replace the condenser in a case like this. When your AC compressor isnt running, the pressure in your system equalizes between the high and low side. As would be expected! Wrap the valve in a thermo-insulation material, using either glue or other packaging material. Also when i have been turning my car off there have been a mechanical sound around the compressor. She blows cold,air just wondering how hot is the high pressure line supposed to get ..can it be there is air in the system .. On a 95 degree day, the low side should be reading at or around 35 PSI, so it sounds like the A/C is in normal working condition. You can check the system with a gauge and partially deplete the system if need be. A blockage in your system will reduce airflow through your condenser, making the air conditioning system unable to cool down. overheating fix automotivesblog Car/AC on, The needle doesnt move. Thank you for asking about your Chevy. Usually, when this occurs, all warning signs should be heeded immediately before major issues arise, such as rapidly rising temperatures inside vehicle cabins or increased risks with driving conditions outside during summer months where they may become too hot for comfort without air conditioning; on board! 928 valve heater porsche problems vacuum heating s4 rennlist core forums hvac actuators coolant service svc pirtle members We recommend replacing the low-pressure switch in this instance. Hi I have a 2011 Mercury Milan premier 3.0 it takes 22 oz of r134a what is that on PSI low pressure side. I didnt realize it might be wired through the HVAC Module though so I may take that out and try as well. What may be wrong? When the compressor is off, its normal for low side pressures to be 25-40 psi, and high side pressure can get up to 200+psi.

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