A/C not blowing cold air

Tiny
CINDYDENMARK
  • MEMBER
  • 1999 GMC SIERRA
  • 220,000 MILES
Getting hot air regardless if A/C is on or just fan or outside air or inside air. Temperature control and be on cold and the air is hot, if on hot then air is hotter. Not sure if a control issue, air actuator issue, thermostat. Any suggestions would be appreciated. Compressor is working and Freon seems good.
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Thursday, November 22nd, 2012 AT 11:44 PM

25 Replies

Tiny
CADIEMAN
  • MEMBER
Is the AC clutch engaging? If not you will need to check the Freon level is maybe why the clutch isnt engaging.
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Friday, November 23rd, 2012 AT 12:33 AM
Tiny
CJ MEDEVAC
  • EXPERT
Is the low side or suction line from the compressor to the firewall getting cold?

The medic
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Friday, November 23rd, 2012 AT 1:03 AM
Tiny
CINDYDENMARK
  • MEMBER
Not sure about AC clutch, how do I check that? The line is getting cold as normal.
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Friday, November 23rd, 2012 AT 1:21 AM
Tiny
CJ MEDEVAC
  • EXPERT
Clutch will operate the compressor similar to this.

When the center stops turning the compressor is not turning it is normal for it to cycle off and on just not all of the time correct pressures in the system determine what it does.

Http://www.youtube.com/watch?v=kp8pxmlfq_w

The line is getting real cold?

The medic
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Friday, November 23rd, 2012 AT 1:34 AM
Tiny
CINDYDENMARK
  • MEMBER
The compressor appears to be working properly and yes the line is getting very cold.
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Friday, November 23rd, 2012 AT 1:39 AM
Tiny
CINDYDENMARK
  • MEMBER
I will check the clutch operation and compressor again tomorrow just to be sure.
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Friday, November 23rd, 2012 AT 1:41 AM
Tiny
WRENCHER1
  • MEMBER
The temperature is controlled by the use of an air mix door that is operated by an electric motor/actuator. This door can be jammed or the actuator can be inoperative or have stripped plastic gears internally.
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Friday, November 23rd, 2012 AT 2:20 PM
Tiny
CINDYDENMARK
  • MEMBER
It is an automatic
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Friday, November 23rd, 2012 AT 4:08 PM
Tiny
CINDYDENMARK
  • MEMBER
It is an automatic and the clutch appears to be working properly.
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Friday, November 23rd, 2012 AT 4:18 PM
Tiny
CINDYDENMARK
  • MEMBER
Wrenchtech, is there a way to check the actuator or gears? Where is that located.
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Friday, November 23rd, 2012 AT 4:20 PM
Tiny
WRENCHER1
  • MEMBER
Other than physically touching them and feel if they are responding or not (which may not be accessible), you need some very expensive equipment to diagnose the issue
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Friday, November 23rd, 2012 AT 4:30 PM
Tiny
CINDYDENMARK
  • MEMBER
Ok, where r they located, under dash?
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Friday, November 23rd, 2012 AT 4:31 PM
Tiny
WRENCHER1
  • MEMBER
It's buried under the dash

http://i1198.photobucket.com/albums/aa448/Wrenchtech/79212366.gif
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Friday, November 23rd, 2012 AT 4:32 PM
Tiny
CINDYDENMARK
  • MEMBER
Ok, thanks
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Friday, November 23rd, 2012 AT 4:34 PM
Tiny
CINDYDENMARK
  • MEMBER
Anyone have any other suggestions before I start disassembling the dash? Thanks to all who have replied.
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Friday, November 23rd, 2012 AT 9:24 PM
Tiny
WRENCHER1
  • MEMBER
The only suggestion I have is to have it diagnosed properly. I doubt disassembling the dash is going to help you much.
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Friday, November 23rd, 2012 AT 9:27 PM
Tiny
CINDYDENMARK
  • MEMBER
Ok, money is very slim right now and I know a little about vehicles, I was hoping if just a gear issue, I could find it and replace gear or what ever it may be and not have to pay the labor for someone else to do it. Thanks so much for info.
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Friday, November 23rd, 2012 AT 9:31 PM
Tiny
WRENCHER1
  • MEMBER
The gears are plastic so if you hear any clicking noises when you try to change temp, that would point to a stripped actuator but it doesn't have to make noise.
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Friday, November 23rd, 2012 AT 9:35 PM
Tiny
CINDYDENMARK
  • MEMBER
Ok, there is no noise. The temperature control seems to be moving more freely than before but not sure.
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Friday, November 23rd, 2012 AT 9:38 PM
Tiny
CADIEMAN
  • MEMBER
If you have someone turn the air on and off from inside the car u should see the compressor clutch engage and disengage. If it is engaging and not cycling than the Freon level should be fine. You need to get a pair of gauges on this car so u will get some reading for us. Then we can go from there. You may have a problem with the recirculation door not closing.
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Friday, November 23rd, 2012 AT 11:25 PM

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