Air conditioner not working?

Tiny
JUANCAMPOSRIVERO
  • MEMBER
  • 1999 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 139,000 MILES
My air is not working is just blows warm air?
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Tuesday, May 25th, 2010 AT 3:09 PM

33 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
This sounds like the system is low on charge this video and guides will wil you fix the problem.

https://youtu.be/uZrQCGwXfek

and

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

and

https://www.2carpros.com/articles/replace-blend-door-motor

Please run down these guides and report back.
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Wednesday, May 26th, 2010 AT 9:15 AM
Tiny
BAMACOWBOY1374
  • MEMBER
  • 1 POST
  • 1999 GMC YUKON
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
New rear evaporater. The nut on the big line was messed up. Went to parts store to have new end put on. The new end would only screw on about 2 turns. The threads both look the same. Possible they are different threads or is this common that it would be this tight because the aluminum is so soft.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
No, it should thread together easily. There are 2 different thread types, metric and SAE and you may be mixing them together or the mating part may be damaged.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
BIGGJAMES100
  • MEMBER
  • 1 POST
  • 1999 GMC YUKON
  • 5.7L
  • V8
  • RWD
  • AUTOMATIC
  • 143,000 MILES
Hello, I have a 1999 GMC Yukon SLT. I've been noticing for a while now, that when I cut my heater or A/C on it doesn't blow through the vents on the dash. But it blows underneath the dash onto the feet in order for me to cool down or heat up the inside faster I have to use the rear passenger vents. Any idea what could be the issue? All of the lights and stuff work, it's just the front dash vents blow.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You actuator is not working right, try pulling hvac fuse inside truck with key on for 60 seconds and it may reset. If not thenyou will probably have ot replace it see pic.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
ILEANNI
  • MEMBER
  • 2 POSTS
  • 1999 GMC YUKON
  • 130,000 MILES
My a/c compressor pulley is freezing up. If I get a smaller belt can I bypass that pulley as a temp fix until i'm able to get a new one?
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
A company called dorman makes a replacement bracket with a pulley to eliminate the ac compressor and use the oem belt. Check at a parts store.

Roy
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
ILEANNI
  • MEMBER
  • 2 POSTS
Well at this moment I can't afford to buy any kind of pulley whether it's the a/c compressor pulley or the one that you're talking about. I was just wondering if I can just get a smaller belt and completely bypass the a/c compressor even if that means not being able to run my a/c. I'm in a desperate attempt for a quick fix because I can't afford to lose my job because I don't have transportation. Will the smaller belt bypassing the ac compressor fix the problem for now? Thanks you so much for your time and advice.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Need to know what amp your alternator is?There is belts without ac but need to know what the amp rating of the alternator is to get the correct number.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
There is a belt for without ac but you need another pulley for it to work. If you have to buy the pulley and the belt, it would be cheaper to buy the bypass pulley

Roy
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
CAROLINACARCONNECTION
  • MECHANIC
  • 66 POSTS
  • 1998 GMC YUKON
Expert here needing some help with a/c
my truck is a 98 yukon. Had some a/c problems causing the high side to be super high and kick out. Got my blockage fixed but my high side is still running up there pretty high 350-375. Have I blown my compressor? System has been flushed oiled and vac'd and charged with the correct amount of r134.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
CAROLINACARCONNECTION
  • MECHANIC
  • 66 POSTS
Ps new condensor new reciver dryer new orifice tube.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
What is the low side?
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
CAROLINACARCONNECTION
  • MECHANIC
  • 66 POSTS
55-57 psi ambent temp is about 96-98
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
There seems to be too much freon in system.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
CAROLINACARCONNECTION
  • MECHANIC
  • 66 POSTS
Its not a overcharge issue. It started running high when the first 8 ounces were added
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
NAVYCLAY
  • MEMBER
  • 2 POSTS
  • 1997 GMC YUKON
  • 190,000 MILES
I'm replacing the A/C hose assembly on a 1997 GMC Yukon without rear A/C. The old part has three ports that come out above the compressor. High pressure, Low pressure, and some electrical port that plugs into a wire assembly. The new part I recieved form the auto parts store has the three ports, but the one where the electrical component should be is just a regular port similar to the high and low ports, only without a cap. The hose assembly for the model with rear A/C has the electrical component I need, but it also has an extra hose that I don't. Removing the electrical portion I need for the old part does not look like an option as it appears to be welded or pressed on. How should I proceed? Is there an adapter part required or is the electrical portion even necessary? Please help. Thanks.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I think it would be easier to get the correct hose than try and manipulate the hose to fit.

Did they not have the correct hose?

Roy
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Was the system evacuated? If it is not overcharging then there is air in system. Both low and high are showing high pressure.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)
Tiny
NAVYCLAY
  • MEMBER
  • 2 POSTS
Roy,
The hose they gave me is correct except it's missing an electrical connection at one of the ports on the housing that attaches onto the compressor. I think it's a sensor or a switch, but I'm not sure. It has a port similar to one you would plug a compressed air hose onto rather than an electrical housing for an electrical connector. The images below are the hose with and without rear a/c. The one with rear a/c has the electrical connection needed, but the extra hose that is not. I forgot to metnion that the engine is a replacement of the original so that may be a factor.
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Thursday, July 16th, 2020 AT 12:17 PM (Merged)

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