GETTING HOT AIR REGARDLESS IF AC 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
  • 9,225 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
  • 9,225 posts

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
  • 9,225 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
  • 9,225 posts

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
  • 20,028 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

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