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Ac system why can i not find the low pressure fitting on this particular model. i can find the high side but not the low side. we were going to shoot one charge of freon into it to see if it would help.

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Do you know where the low side of a chevy cobalt (2006) is ?


Normally the low pressure and High pressure lines run on the passenger side of the engine area. They are the two aluminum lines that run to the firewall from the AC compressor. The good news is the refill can you are going to use to refill your system will only fit the low side line. The fitting is most likely covered by a plastic dust cap to keep it clear.

Sep 17, 2011 | 2006 Chevrolet Cobalt

2 Answers

I have a 2006 Envoy, and it appears to freon is low. I purchased a can of freon from Auto Zone. Tried to put the nipple over the lower valve and it won't connect and snap in. I end up sending freon...


ok, there is a high side, high pressure line, and low side, low pressure line, for your AC. That refill can you purchased has an R134a connector. It will only connect to the low side of teh AC system as they are different sizes. If you try to connect it the best case scenario is what you described, the connector won't lock in place and it sprays every where. The worst case scenario is the can blows up. Make sure you have the can completely connected and the connector locks down or your on the wrong valve and may damage your system or injure yourself.

Jun 10, 2011 | GMC Envoy Cars & Trucks

1 Answer

Where do I charge r134 coolant? the adapter on can fits the high pressure valve and the low pressure valve is too big? please help..


can't be.the larger port is the HP side, and the hose on your can will only fit the low (small) pressure side-you CAN fill a system on the HP side, engine off, by hooking up to the HP side and inverting the can so that liquid 134a fills the high side-but it is not recommended if you do not have manifold gauges and aren't experienced with AC systems.

May 31, 2011 | 1998 Toyota Corolla

1 Answer

Need air cindition recharge, don't have cash to take it someplace, can you help with instructions to do this


YOU NEED A R-134 GAUGE SET TO CHECK LOW PRESSURE SIDE AND HIGH PRESSURE SIDE.YOU ALSO CAN BUY A LITTLE CHEAPER GAUGE TO CHECK YOUR AC LOW BLUE SIDE AND HIGH RED SIDE AT ANY AUTO ZONE OR ADVANCE AUTO PARTS.WHAT YOU DO WHEN YOU GET YOUR GAUGE SET HOOK GAUGE TO LOW PRESSURE SIDE BLUE CAP PORT AND GAUGE TO HIGH SIDE PRESSURE RED CAP PORT.YOU CRANK CAR UP GET IT OPERATING TEMPERATURE.THEN TURN AC ON HIGH COOL LET RUN 3 TO 4 MINUTES.CHECK LOW SIDE GAUGE READING SHOULD BE 28 - 32 PSI. HIGH PRESSURE SIDE GAUGE SHOULD 199 - 228 PSI. THATS NORMAL CHARGE. SEE YOU CANT JUST RECHARGE AC SYSTEM UNTIL YOU CHECK IT FIRST YOU WILL DAMAGE SYSTEM .NOW YOU CAN GO TO AUTO ZONE PARTS BUY A CHARGE CAN WITH GAUGE AND HOSE.ATTACH TO IT.YOU NEED MORE THAN ONE CAN.WARNING MAKE COMPRESSOR IS RUNNING WHEN YOU TURN ON AC .BECAUSE IF COMPRESSOR NOT RUNNING CHECK FUSE AND AC COMPRESSOR RELAY.IF BOTH OKAY.YOU COULD HAVE OPEN CLUTCH COIL A FAULTY LOW PRESSURE SWITCH WILL CAUSE AC NOT TO WORK. IF LOW PRESSURE GAUGE BLUE SIDE PRESSURE IS 28 OR 30 YOU DONT NEED A CHARGE.PROBLEM SOME WHERE ELSE.BE SURE TO WEAR SAFETY GLASSES WHEN WORKING ON AC SYSTEM.

Jun 26, 2010 | 2004 Hyundai Elantra

1 Answer

Ac not working


1st you must check for correct refrigerant levels in ac system, must be done with a/c guages, you have a pressure switch that senses correct pressure in a/c system if you are low in refrigerant the a/c will not come on. if you have good pressures high side 70-95 low side 70-95 depends on ouitside air temperature, with the engine off then look at the switch in the high pressure line, jeep also has a fuse in the fuse box under the hood and a a/c relay please check those too. I hope this helps. (red is high side hose- small fitting plug , blue is low side- larger fitting If ac is working and compressor is on good pressure ranges from high side the red hose 160 to 230 depending on temperature outside; low side blue hose 27-46 low side depending on outside temperature, Wear glasses to protect your eyes. I hope this helps good luck

Sep 10, 2009 | 2006 Jeep Liberty

2 Answers

AC not cooling for 97 Passat TDI


A/c should be charged on the low side while engine is running. Make sure high side valve is turned off. Low side reading should be around 32-35 psi at idle high side should not go above 250. I hope this helps,good luck

Aug 01, 2009 | 1999 Volkswagen Passat

1 Answer

95 Deville - Low Refridgerant/AC Comp. off


To diagnose problems, an A/C manifold gauge set is needed to read high and low side pressure readings. Avoid adding refrigerant with a simple charging kit like the ones sold at parts stores. Don’t add any stop leak, this can cause problems in the compressor, expansion valve or condenser.
Keep in mind that using an A/C gauge set and seeing BOTH high and low side readings can help in diagnosing the problem when you know what to look for. First, on a 134A system the high and low side service ports are different sizes. AC gauge sets have color coded hoses, the blue color coded hose has a connection that fits on the low side service port and the red hose has a connection that will only fit onto the high side. The yellow hose won’t hook up to anything if just checking the readings; it can be used to connect to a vacuum pump or attached to a refrigerant can or tank.

Normal readings on high and low side with AC OFF (static pressure) - Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s - Ranges from 25-35 PSI - Note that on many Chrysler products a normal reading on the low side may be 15-25 PSI
Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better!  Overcharging just a little can decrease the performance of the system and possibly damage the compressor.

Both low and high side readings are lower than normal, this indicates a cars AC system is low on refrigerant and is under-charged.
If both low and high side readings are too high, this indicates an overcharged system - too much refrigerant. This also can indicate that the condenser fan is not working, is too slow or the car is overheating and heat is transferring from the radiator to the condenser.

Good luck and hope this helps, keep me posted be glad to answer any question you may have. And yes the A/C system on your car uses R143a and there is a A/C pressure switch along the low pressure line or on the accumulator, it looks like a oil pressure sensor with a two wire lead cliped on it. 

Jul 02, 2009 | 1995 Cadillac DeVille

1 Answer

I want to do ac charge cant see fitting to do this


Ther are two fittings in the system, the low and high sides. You want to charge through the low side. Following the line from the firewall(right side) on the Aluminum expose pipi there should be a fitting. The fitting is larger than the high pressure side and cannot be mistaken. The high pressure lfitting is smaller and on a small steel line coming from the condensor in front of the radiator. Both are accessible working from top of engine.

Jun 21, 2009 | Ford Taurus Cars & Trucks

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