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AC not working

Tiny
DAISY738
  • MEMBER
  • 2001 CHEVROLET TAHOE
When I left to run errands today the AC was working fine. After the first stop, I got back in and it was blowing warm air. I was never able to get it to blow cool air again. Any ideas whats wrong?
Monday, June 28th, 2010 AT 9:07 PM

26 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hello,

It sounds like the system is low on refrigerant but to be sure here is a video to show you how to check it

https://youtu.be/uZrQCGwXfek

this guide can help as well

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

Please run down these guides and report back.
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Monday, June 28th, 2010 AT 9:15 PM
Tiny
DAISY738
  • MEMBER
  • 2 POSTS
Not to sound like a dumb girl, but low and high pressures of what? Are you refering to having the ac on with the control?
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Monday, June 28th, 2010 AT 10:39 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Okay I understand in other words have the freon/refrigerant checked, you start here
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Monday, June 28th, 2010 AT 11:44 PM
Tiny
SASSI_FRASS
  • MEMBER
  • 1 POST
My 2002 Tahoe is doing same thing. Compressor & clutch working fine. Small tube is ice cold but not freezinf. Freon gauge reads full. Had water in cargo area but after finding clogged drain and cleaning out, that problem is solved. Could there be another clogged drain causing my problem?
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Tuesday, September 4th, 2012 AT 7:14 PM
Tiny
RANDY SHARP
  • MEMBER
  • 164 POSTS
  • 2001 CHEVROLET TAHOE
  • 80,000 MILES
2001 chevy tahoe, having some ac issues system blowing warm air.I thought it might be the temp control switch but it was fine cable was good and the door under the dash was closing and sealing. But the other day I was checking the condenser for anything blocking it from getting air it was fine, then I started it up and now the compressor is not engaging and I want to put freon in it. So here is my question I know you can manually use a fused jumper wire by taking the ac relay out and running a hot from battery to a connection where relay is I need to know which one it is this truck has automatic climate control does anybody know? I do not have a manual
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a pro look at this if Freon leaked out ti won't stay long and you'll waste your money
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
RANDY SHARP
  • MEMBER
  • 164 POSTS
Hey thanks again but really what I need to know is I have to have that clutch engaged as I am adding the freon right, and I wanted to know if you knew what terminal it would be where the relay goes so I can run a jumper wire from there to the battery, so I can get the clutch engaged manually.I would appreciate it I don't have a manual for this truck. Thank you again
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If you start to put the Freon in it may allow you to engage the clutch so it will take the rest in. The amound should have a sticker on the radiator if you need to jump it use the pressure switch on the accumaltor, but you probably won't as it fills or even with the first can sending pressure in it wil problably work. You really shouldn't do this though as it may only last a day or two anyhow.
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
RANDY SHARP
  • MEMBER
  • 164 POSTS
OK I know what switch you are talking about just unplug it and what terminal do I jump it to. Sorry for all the questions.I have learned alot from your experience.I really appreciate it.
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Yu just unplug it andjump form one sside ot the other, but if youget like 3/4 can in plug it back in
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
KEITH THOMPSON2
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
The compressor went out so I put a new one in then I refilled with r-134 and it started working fine one to two days later and the A/C clutch will not kick on anymore have done this twice. Now I went to add some more cause it stopped again and the gauge says the Freon is full but it will not turn on. Any ideas on what this is the A/C is blowing hot air? Before I changed the compressor out I changed the orifices in front and back of the vehicle so I would not think those are plugged.
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
RANDY SHARP
  • MEMBER
  • 164 POSTS
Ok thanks for the help on the ac it is fixed. Now I have another question for you. I have this 1981 cad sedan de ville getting no fuel to engine my manual does not show anything I need to know inside the cat it has 2 fuse boxes one of them holds the relays do you happen to know which one might be the fuel pump relay?It has a 6.0 8, 6, 4 motor DFI system.
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
If the compressor shelled out and locked up, you may have debris in the lines.

Inspecting the first orifice in line may confirm this.

The Medic
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Boy you surelike punishment with that motor lol. See pic
Image (Click to make bigger)
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,607 POSTS
Hello,

I would use a test light and check for power at the compressor clutch.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

This will let you know if the clutch coil is not working correctly or if there is some other problem we can hunt down.

Please run this test and get back to us so we can continue helping you.

Cheers, Ken
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
R2BUFFALO
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 71,000 MILES
I want to add some A/C refridgerant to my system. Exactly where is the fitting to do this. On a 2001 V8 Tahoe
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Look for the BLUE cap on the accumulator on the right side of the inner fender.
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
The correct fitting should have a blue cap, the red one is always the wrong one, so what ever color is the other one then that will be the correct one, because sometimes it will be black
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
The other thing is these recharge cans only fit the LOW side, it is larger in diameter than the high side, also charge with the can upright ONLY, or system damage can occur.
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Thats a very good point, thanks merl
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Sunday, July 28th, 2019 AT 7:02 PM (Merged)

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