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AC quit... getting hotter every day


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mudpuddle
New User

Jun 18, 2017, 11:34 AM

Post #1 of 8 (559 views)
AC quit... getting hotter every day Sign In

2002 GMC Sierra 1500, 4WD, 340,000 miles
Truck runs great... last year i had my AC compressor replaced after it died.. The replacement worked for two weeks.. then no air again. I took the truck back to my mechanic and he discovered that there is no power going to the compressor... didnt have time to figure it out, and it was september so i let it go.. but now its June... ugh...what do i do to figure this out....


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 18, 2017, 12:08 PM

Post #2 of 8 (556 views)
Re: AC quit... getting hotter every day Sign In

Did you find the cause of the original compressor failure? What type of failure was it?

What else did you replace along with the compressor?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mudpuddle
New User

Jun 18, 2017, 1:17 PM

Post #3 of 8 (545 views)
Re: AC quit... getting hotter every day Sign In

I Just thought that the original failure was because of age... we replaced the compressor, evaporator drier, and some tube thingy... dont recall exactly... I'm an OK mechanic, but not when it comes to AC systems... I generally leave it to the pros... or endure the heat...


mudpuddle
New User

Jun 18, 2017, 1:22 PM

Post #4 of 8 (541 views)
Re: AC quit... getting hotter every day Sign In

i was going to bring it back to him, but was wondering if there was anything simple that i might be able to find.... I think he said there was no power getting to the unit up near the firewall..not the compressor itself like i mentioned in the earlier post...


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 18, 2017, 1:24 PM

Post #5 of 8 (541 views)
Re: AC quit... getting hotter every day Sign In

Compressors rarely die of old age. It's usually something else that puts it under strain.

If the compressor had an internal failure, the condenser should have been changed also as that is where all the metal particles from the compressor landed. That will restrict the condenser and lead to a premature compressor failure.

Your first step now is to determine if you have an electrical issue, mechanical issue or gas issue. Find out if the compressor is frozen and whether it has sufficient gas pressure to engage the compressor.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 18, 2017, 1:26 PM

Post #6 of 8 (537 views)
Re: AC quit... getting hotter every day Sign In

You can test all your fuses but not much beyond that.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mudpuddle
New User

Jun 18, 2017, 1:31 PM

Post #7 of 8 (535 views)
Re: AC quit... getting hotter every day Sign In

condenser tube... i think that was the other part..
when i brought it back, he tested the pressure, no leaks.. plenty of coolant.

I'm guessing it could be electrical as this truck has had other electrical issues. things like...Gas guage wont work... replaced twice..i can trick it to come on if i toggle between the fresh air/recycle air switch...makes no sense.. Low fuel indicator comes on even when you have a full tank.. For a while.. there was a damper in the duct line somewhere under the dash with a relay that would engage constantly... it has since stopped, but probably because it fried???


Sidom
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Jun 19, 2017, 8:16 PM

Post #8 of 8 (501 views)
Re: AC quit... getting hotter every day Sign In

Sounds like you are talking about an orifice tube....

Those old GMs were good for a knocking noise under the dash due to a bad temperature actuator....

Not sure how you are with electrical but this one is pretty easy to diag......Just start at the a/c relay in the box under the hood....

Terminals #30 & 86 both should have 12v with the koeo (#30 is hot all the time) #87 should show a good ground at all times & #85 with show a good ground when the a/c button is pushed....More than likely one of those is missing power or ground...

If something is wrong with the system and the PCM doesn't like what it is seeing....it won't ground #85 and no a/c






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