Automotive Air Conditioning Information Forum (Archives)
Jeep Cherokee AC issue
Truckedup on 
Sun July 18, 2010 5:28 PM 
I have a AC issue on my 99 Jeep Cherokee;turn on the AC and it all works fine,blows cold for around 15 minutes then it starts to blow warm.Turn off AC for 10 minutes and it'll work ok for awhile and then cuts off and so on.I don't have a real guage set but do have a low pressure gauge I was able to properly hook up on the suction side,40 psi when it's blowing cold.A friend told me that Mopar compressor clutches can act up and try to clean it out with compressed air.I did that and a lot of what looked like rust dust came out.The AC seemed to work better for a time,and then acted up again.Blew out the clutch and a lot of dust came out. I'm thinking the compressor clutch may need a replacement.Obiviously there's other components that cause this problem.What do you think? Thanks.
bohica2xo on Sun July 18, 2010 6:18 PM
You probably need to adjust the clutch plate gap. That "dust" you blew out was really the worn off clutch material.
The gap should be no more than .020 for reliable operation. It can be very close (.005 or so) as long as it does not touch when the power is off. Check your clutch gap, if it will take more than a business card it needs adjustment.
The clutch plate is adjusted by removing or adding shims. The nut in the center of the plate is what holds it on the shaft, the shims are behind the plate on the shaft.
B.
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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
Truckedup on Mon July 19, 2010 6:03 PM
It's very easy to pull off the compressor plate.Found one shim in there so probably it's been adjusted in the past.I removed that shim,the AC appears to work just fine now.Might be a good idea to check out the clutch condition during the winter? Thanks for the tip!
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