- #24 of 82
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Re: 99 GMC Jimmy A/C blowing warm [mkob]
by jlflemmons
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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!
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- #25 of 82
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Re: 99 GMC Jimmy A/C blowing warm [jlflemmons]
by tsg3313
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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
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- #26 of 82
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Re: 99 GMC Jimmy A/C blowing warm [tsg3313]
by jlflemmons
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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.
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- #27 of 82
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Re: 99 GMC Jimmy A/C blowing warm [jlflemmons]
by repairdog
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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.
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- #28 of 82
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Re: 99 GMC Jimmy A/C blowing warm [repairdog]
by jlflemmons
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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. 
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- #29 of 82
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Re: 99 GMC Jimmy A/C blowing warm [jlflemmons]
by repairdog
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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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- #30 of 82
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Re: 99 GMC Jimmy A/C blowing warm [repairdog]
by jlflemmons
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Apr 03, 2007 (7:40 pm)
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Replying to: repairdog (Apr 03, 2007 2:29 am)
Well, we've already had some pretty warm days here, but it cools really well and doesn't make any noise.
Does have an odd little rattle coming from somewhere at certain engine speeds, but not a/c related. Maybe cat?
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- #31 of 82
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Re: 99 GMC Jimmy A/C blowing warm [jlflemmons]
by repairdog
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Apr 04, 2007 (3:13 am)
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Replying to: jlflemmons (Apr 03, 2007 7:40 pm)
Could be the exhaust - most good muffler shops will put it on the lift and tap along the system to find the rattle - could be baffles in the muffler (most common), cat failing internal, mount bad, even the O2 sensors (heated so an external shield and I had one rattling) or its a 99 so you have the wonderful secondary air injection system with check valves on each exh manifold that rattle when they fall apart inside and the electric pump under the radiator that comes on for 1 min each start to blow air in to prefire that cat and those heated O2 sensors! Look that up I've posted several fixes on that.
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- #32 of 82
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95 GMC Jimmy Air Conditioning Problem
by als95gmc
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May 31, 2007 (7:20 pm)
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I had someone replace my freeze plugs recently and since then the air conditioner won't turn on. When I switch the dial to Air the fan comes on, but the compressor is not kicking on. I had the same guy look at it. The compressor kicks on when he jumped it directly (if that makes sense) and he says the relay is OK. The fuse also checks out. Any suggestions? Is there another set of fuses somewhere? Thanks for any help.
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- #33 of 82
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Re: 95 GMC Jimmy Air Conditioning Problem [als95gmc]
by repairdog
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Jun 01, 2007 (1:43 am)
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Replying to: als95gmc (May 31, 2007 7:20 pm)
Possible faulty connector or loose pins in one, low pressure or pressure switch bad, compressor leaked so low pressure. Need to have test gauges to find so go to an AC shop and most do system test for free or low price before giving you an estimate.
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