- #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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- #34 of 82
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Re: 95 GMC Jimmy Air Conditioning Problem [repairdog]
by als95gmc
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Jun 02, 2007 (3:09 pm)
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Replying to: repairdog (Jun 01, 2007 1:43 am)
Will do. Thanks.
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- #35 of 82
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Blazers air prob
by 20blazer00
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Jun 11, 2007 (11:25 am)
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I have a 2000 Blazer Ls.
For some reason the a/c blows cold and then warm, it is constantly switching back and forth. I told the service manager about it today while it was getting a window switch replaced. I asked if if just needed recharged.
He said " No, it wouldnt blow cold at all if it was low on freon. It must be a switch going out. "
What do yall think? If it is a switch, can it be replced by yourself or have to have a shop do it? And what and where is this switch?
Thanks
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- #36 of 82
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Re: Blazers air prob [20blazer00]
by repairdog
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Jun 11, 2007 (1:43 pm)
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Replying to: 20blazer00 (Jun 11, 2007 11:25 am)
If it has auto climate system (select a temp on the dial in degrees and it maintains it) you have an additional electric blend motor on the heater/AC box and they have a plastic gear that goes so cycles hot/cold as it can't figure out where it is. On top of the heater box and let the dealer do it. Motor about $200 plus labor.
If a switch it could have an intermittent short or connection on the compressor or the pressure switch - AC guy can find it .
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