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Author Topic: A/C continues to run with "Vent" selected  (Read 2236 times)

Offline Edahall

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  • Posts: 311
A/C continues to run with "Vent" selected
« on: November 28, 2011, 02:30:40 pm »
Vehicle: 1990 Suburban

Several days ago as I was driving, I noticed that very cold air was coming out of the vents even with "vent" selected on the controls. I started investigating and the A/C compressor is now stuck on with "vent".   However, the A/C compressor does disengage when "heat" is selected on the controls.

How can I fix this problem?
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1990 ¾ ton 4x4 Chevy Suburban
-Cummins Diesel - 12 valve - factory rebuilt
-6 speed bullet proof manual transmission - NV5600
-Gear Vendors Overdrive
-Upgraded Holset HX-35 turbo
-NP205 iron transfer case
-3.73 gears
-2" Lift

Offline DrDaryl

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  • Posts: 62
Re: A/C continues to run with "Vent" selected
« Reply #1 on: November 28, 2011, 04:11:59 pm »
On mine it was the "AC actuator switch" located on the climate control unit--had a hole burned through it and the compressor ran all the time--might help.
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Offline Edahall

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  • Posts: 311
Re: A/C continues to run with "Vent" selected
« Reply #2 on: November 28, 2011, 06:34:19 pm »
Quote from: DrDaryl on November 28, 2011, 04:11:59 pm
On mine it was the "AC actuator switch" located on the climate control unit--had a hole burned through it and the compressor ran all the time--might help.

Thanks,  I bet this switch is the culprit on mine as well.  Maybe it's out of adjustment or needs cleaning.
Logged
1990 ¾ ton 4x4 Chevy Suburban
-Cummins Diesel - 12 valve - factory rebuilt
-6 speed bullet proof manual transmission - NV5600
-Gear Vendors Overdrive
-Upgraded Holset HX-35 turbo
-NP205 iron transfer case
-3.73 gears
-2" Lift

Offline Project86

  • Newbie
  • Posts: 38
Re: A/C continues to run with "Vent" selected
« Reply #3 on: November 29, 2011, 09:57:45 pm »
I also had this and found a hole burned through the actuator switch. Replaced it with a new one from Auto Zone, problem solved!
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86 Silverado C10 S/B
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