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Compressor engagement timing

rdbashaw on Sat August 09, 2008 5:33 PM User is offline

Year: 2002
Make: Jeep
Model: Grand Cherokee
Engine Size: 4.0L
Refrigerant Type: r134
Country of Origin: United States

My a/c starts out cold, but will not stay cold. Now and then I feel a puff of a/c but that is it. When I hook a pressure gauge to my low/side and watch, the pressure starts at about 25lbs, goes up to about 45-50lbs. At this time, the clutch engages and, the pressure drops back to 25lbs. But the clutch only stays engaged for only 2 or 3 seconds and releases. Then the pressure starts rising again and the process is repeated. Is this normal? It seems the longer it runs, the longer it takes for the clutch to engage again. What is going on? Is the problem a bad pressure switch?
Thanks,
Rick

Chick on Sat August 09, 2008 6:20 PM User is offlineView users profile

You could be low on refrigerant, what are the high side pressures when the cycling occurs?? You really need both pressures when charging or checking a system.. Hope this helps..

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Chick
Email: Chick

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