A/C issue
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Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
A/C issue
2000 Silverado, A/C kinda comes and goes. Will work fine every time getting into the truck, but after a while, it seems as if the compressor doesn't engage, air coming out of the vents gets warmer. A/C isn't much my thing. Any suggestions? Thanks.
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Does the compressor stop cycling when this happens? Is the air warm all the time, or only during acceleration?
If it only warms during acceleration, the vacuum reservoir is not holding vacuum for some reason. Broken/missing vacuum hose.
Compressor fast cycles, low on freon.
Compressor stops cycling, low pressure cycling switch on accumulator, low freon.
A pressure check with gauges would help isolate the problem. jd
If it only warms during acceleration, the vacuum reservoir is not holding vacuum for some reason. Broken/missing vacuum hose.
Compressor fast cycles, low on freon.
Compressor stops cycling, low pressure cycling switch on accumulator, low freon.
A pressure check with gauges would help isolate the problem. jd
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Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
Compressor cycles fine, then stops when this happens.
Warm air comes and goes, doesn't seem to rely on acceleration. It works one minute, and then stops the next minute. Vacuum is good.
Compressor doesn't cycle fast as compared to my Ranger. I'll check the pressure tommorow morning.
Thanks for the reply.
Warm air comes and goes, doesn't seem to rely on acceleration. It works one minute, and then stops the next minute. Vacuum is good.
Compressor doesn't cycle fast as compared to my Ranger. I'll check the pressure tommorow morning.
Thanks for the reply.
Post Fiend
Joined: Jun 2002
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From: Atlanta GA
I haven't worked on any 2000+ Chevys, but, on the older ones, under the hood near the heater box it is called
(using the terms from Advance Auto) "Factory Air Heater Control Valve" or "Heater Control Valve".
You might also have a direct vacuum feed going directly into the heater box which feeds directly to the HVAC controls on the dash (like that on my Impala). You can take a brake bleeder and apply vacuum from under the hood to it just by disconnecting the hose.
(using the terms from Advance Auto) "Factory Air Heater Control Valve" or "Heater Control Valve".
You might also have a direct vacuum feed going directly into the heater box which feeds directly to the HVAC controls on the dash (like that on my Impala). You can take a brake bleeder and apply vacuum from under the hood to it just by disconnecting the hose.
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I'm not sure with the 2000, but on models with the hose on top of the engine going from the accum to the compressor to the cond, these things leak. I have replaced several of them. The fill valve leaks and is not replaceable, you have to replace the hose, a hundred buck item.
The orifice could also be contaminated with junk, or is icing up due to moisture in the system. jd
The orifice could also be contaminated with junk, or is icing up due to moisture in the system. jd
Lead Driver
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From: Abilene Kansas
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Posting Guru
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Originally Posted by fordboy_52
sounds to me like its not fully charged.
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Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
Got the gauges, indeed, it was low. The leak, best I can tell, is coming from one of the valves on the upper line. I've charged it for now, going to find one of those valves, drain the system and replace it.
Thank you guys for the help.
Thank you guys for the help.
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