Getting hot air regardless if A/C is on or just.

Tiny
CINDYDENMARK
  • 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 actuater 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

29 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
  • 9,894 POSTS

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
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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 TIMECORRECT 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
CJ MEDEVAC
  • EXPERT
  • 9,894 POSTS

ROJ

I WILL START LOOKING FOR WHY YOU DON'T FEEL IT INSIDE

I HAVE A PRETTY GOOD HYPOTHESIS

THE MEDIC

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Friday, November 23rd, 2012 AT 1:48 AM
Tiny
CINDYDENMARK
  • MEMBER

Ok, thanks so much.

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Friday, November 23rd, 2012 AT 1:49 AM
Tiny
CJ MEDEVAC
  • EXPERT
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DO YOU HAVE A MANUAL OR AUTOMATIC SYSTEM?

THE MEDIC

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Friday, November 23rd, 2012 AT 3:42 AM
Tiny
WRENCHTECH
  • EXPERT
  • 20,765 POSTS

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
WRENCHTECH
  • EXPERT
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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
WRENCHTECH
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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
WRENCHTECH
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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

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