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Cherokee compressor

themow on Fri June 25, 2010 12:53 PM User is offline

Year: 98
Make: jeep
Model: xj
Engine Size: 4.0
Refrigerant Type: r134a
Ambient Temp: 80
Pressure Low: 55
Pressure High: na
Country of Origin: United States

Hey everyone. Im new to the forum and new to automotive ac although i have worked hvac for a year or so. Last year my ac worked well. This summer my compressor was quickly cycling on and off with a lowside reading of 25 so i figured she was low on refrigerant. I only have r22 gauges so i could not read the high side. But i have a cheapo r134a low side gauge so thats why i only have that reading. Anyway i bought a little can of r134a and got to it. She took it well and the low side went up to 55psi and the compressor stayed engaged and she was blowing cold. For about five minutes. Then the compressor disengaged and will not reengage. Where should i start?

Update: I let the car cool off for a few hours then tried it again. Everything was fine and the compressor was engaged but the car got up to operating temp210 and the compressor disengaged again and would not restart

Edited: Fri June 25, 2010 at 4:06 PM by themow

CCWKen on Fri June 25, 2010 6:53 PM User is offlineView users profile

It's probably over charged. 55psi on the low side is too high. Get a set of reliable gauges on the low and high side and report back.

Ken Kopsky

Custom Car Works
"Rules are for the guidance of wise men and the obedience of fools."

themow on Fri June 25, 2010 8:45 PM User is offline

that sounds right. can i get hoses for my r22 gauges that will work with 134? or is it a whole diff setup?

GM Tech on Fri June 25, 2010 10:37 PM User is offline

Wide air gap- once warm the magnetic field is not able to pull in the clutch--- bump the clutch (while running) next time it is off and should be on- see if clutch pulls in-- if so- then pull off clutch and remove a shim...

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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