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GMC Jimmy Climate Control Problems

82 messages,  Last post on Oct 11, 2009 at 6:56 AM

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What is this discussion about? GMC Jimmy, Heating / Cooling, SUV


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#21 of 82
ac blowing warm by tsg3313
Mar 18, 2007 (4:59 pm)
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I have a 97 jimmy that the ac is not cold. The compressor comes on every 10 seconds or so because I see the clutch engage. I added about 1/2 can of r134a and checked for leak, and found none, any ideas?
 
Thanks!
#22 of 82
Re: ac blowing warm [tsg3313] by repairdog
Mar 20, 2007 (12:47 pm)
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Replying to: tsg3313 (Mar 18, 2007 4:59 pm)

Take it to an AC shop for a test and probably the pressure switch or a loose connector.
#23 of 82
Re: 99 GMC Jimmy A/C blowing warm [jlflemmons] by mkob
Mar 23, 2007 (6:00 am)
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Replying to: jlflemmons (Mar 13, 2007 4:53 pm)

Thank you for the suggestion. I found it was a combination of putting a new belt tensioner on and adding more R134. Even though I did the test for the pressure and it showed I was fully charged I guess my tester was bad. Good news it was not expensive to fix and I did it myself.
#24 of 82
Re: 99 GMC Jimmy A/C blowing warm [mkob] by jlflemmons
Mar 23, 2007 (12:15 pm)
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Replying to: mkob (Mar 23, 2007 6:00 am)

I love it when it works out right. My gauge showed my system to be fully charged also. It was a little over a half pound low, if I recall correctly.
 
Now it will make ice cubes!
#25 of 82
Re: 99 GMC Jimmy A/C blowing warm [jlflemmons] by tsg3313
Mar 31, 2007 (5:17 am)
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Replying to: jlflemmons (Mar 13, 2007 4:53 pm)

where is the pressure switch and harness? and which side do I jumper? I diconnected the harness on the compresor and when jumped blew the ac fuse
 
thanks
#26 of 82
Re: 99 GMC Jimmy A/C blowing warm [tsg3313] by jlflemmons
Mar 31, 2007 (6:10 pm)
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Replying to: tsg3313 (Mar 31, 2007 5:17 am)

I think you figured out that was the wrong harness! You shorted out the compressor clutch circuit. Put in a new fuse and hook that back to the compressor.
 
Then, just in front of the passengers side firewall is a large aluminum cylinder with freon lines going to it. There will be a thing sticking out of the side of it with a connector plugged to it. This is the pressure switch. Disconnect the harness and jumper the contacts with a paper clip or such. This will tell the compressor that there is pressure in the system and keep the compressor clutch engaged. If that compressor starts really rattling or banging, pull the jumper out and find a good A/C shop. It could still be a low freon condition, but more likely a shot compressor.
#27 of 82
Re: 99 GMC Jimmy A/C blowing warm [jlflemmons] by repairdog
Apr 01, 2007 (5:49 am)
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Replying to: jlflemmons (Mar 31, 2007 6:10 pm)

Just a note that the GM compressors usually go by 80-90k and rebuilts are not the way to go - good shops use only new compressors for these at $50 more max. They have had problems with hose pressure switches and also possible loose pins in the rear connector on compressor, but usally the rear seal goes and new comp time.
#28 of 82
Re: 99 GMC Jimmy A/C blowing warm [repairdog] by jlflemmons
Apr 02, 2007 (7:10 pm)
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Replying to: repairdog (Apr 01, 2007 5:49 am)

"GM compressors usually go by 80-90k "
 
Great. My '99 has 78K on it.
#29 of 82
Re: 99 GMC Jimmy A/C blowing warm [jlflemmons] by repairdog
Apr 03, 2007 (2:29 am)
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Replying to: jlflemmons (Apr 02, 2007 7:10 pm)

Summers coming so guess its your time. 3 of my 4 went by then and the 4th has 95k and I'm on borrowed time so can already feel that $700 or so getting sucked out of my wallet.

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