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Compressor for air conditioning not turning. Checked the pressure and it was 35 psi. Any suggestions before I replace the part?

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Check fuses,check wiring connections,especially at pressure switch,usually on accumulator/dryer

Posted on Sep 28, 2009


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Just replaced ac compressor and still not working. replaced a relay also. What would keep itfrom coming on?

Could have a faulty low pressure switch.
The low pressure switch is located on the air conditioning line in the right rear of the engine compartment near the firewall.

The low-pressure switch in your air conditioning system is used to interrupt power to the compressor when the low side pressure drops below 25 psi. This prevents freeze-up of the system and possible damage to the compressor. When the switch is faulty, the symptoms of freeze-up, or no compressor function, will be present. Replacement is straightforward, but requires the removal of refrigerant from the system.

Jul 03, 2015 | 2003 Kia Sorento

1 Answer

Overcharge refrigerant

The low side will not tell you if the system is overcharged or not. You would need a gauge hooked up to the high side to know that.
It could be a relay, ac clutch, or pressure switch problem.
35 - 45 psi on the low side is normal

Jun 25, 2013 | Ford Cars & Trucks

1 Answer

35 pounds of pressure in air conditioning system but 0 when compressor turned on

Detect refrigerant leakage in the system, repair and recharge the gas

Apr 08, 2013 | 2005 Honda Civic 1.7i

1 Answer

A/C Compressor wont kick on unless jumped in fuse box using a paper clip. Compressor does not kick on with relay in place. Freon levels are between 35-40psi on low and 190-200psi on high side.

Normal pressure with the engine-compressor off is outside air temp. So both gauges would read 70 or 80 or whatever.
When the system is running, normal is 30-50 low and 200-300 high.
One thing that comes to mind to test is the low pressure switch.

Jul 14, 2012 | 2001 Chevrolet Malibu

1 Answer

The blower works on my 1998 Ford Escort but the air conditioning does not get cold. How do I know if it just need freon or if it is the compressor?

does the a/c get cool but not cold? if so then may just need some freon. check the low pressure side with the engine idling and blower set to high and on MAX a/c. the low pressure side should read between 35-45 psi , if it is lower than 35 then add 1 can of freon to see if pressure comes up , if it doesn't then you may have a weak compressor or a clogged orfice tube. but if the air is hot and not even cool the you may have a bad comprossor clutch, check to see if it is coming on.

Jul 27, 2011 | 1998 Ford Escort

2 Answers

My 2000 yukon xl air conditioner blows hot air in the rear and in the front at a idle

First, I would check that the a/c compressor is on at idle.
Then, I would check that the fan goes on.
After, that I would check that the plumbing is getting cold on the low side. If it is not, then I would look for causes for that, including but not limited to the r134a refrigerant pressure being too low.

It should read 25 psi to 45 psi on the low side when the a/c compressor is turning, which is normal.

If it reads 75 psi to 100 psi or higher and the a/c compressor is not turning, then there is a problem.

The a/c compressor could be wearing out (its pistons that is) and causing the pressure to not be high enough at idle speed.

Aug 17, 2010 | 2000 GMC Yukon XL

1 Answer

Can i recharge the air conditioning in my 2001 pontiac grand am se 2.4L myself

yes you can! get an r134a hose and 2 or 3 cans of r134a refrigerant. Find the low side port which has a black or blue cap on it (unless it got thrown away) and use the 'quick connector' while the can is screwed on to the other side of the hose.

You can get a recharge kit for maybe $35 at walmart, which has 1 can of freon which might be all you need to get the cold back into your a/c system.

Make sure that the compressor turns and spins with the belt, and also that the fan turns on at the radiator when you put the a/c on high fan and the coolest setting.

The pressure should range anywhere from 25 to 45 psi when you do this procedure, and if the compressor is not turning the pressure should be 75 to 100 psi on a hot day.

Hope this helps!

Jul 08, 2010 | 2001 Pontiac Grand Am SE

1 Answer

No air conditionong have 45 psi freon compressor turns but clutch wont engage when it did it turned on and off numerouse times

You don't have enough freon in it. 45 psi when the compressor is not turning is low, Add one can and see what happens. Normal low side pressure with the compressor turning is 35 psi.

Jun 07, 2009 | 2000 Ford Taurus

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