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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Edahall on November 28, 2011, 02:30:40 pm

Title: A/C continues to run with "Vent" selected
Post by: Edahall 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?

Title: Re: A/C continues to run with "Vent" selected
Post by: 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.

Title: Re: A/C continues to run with "Vent" selected
Post by: Edahall 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.

Title: Re: A/C continues to run with "Vent" selected
Post by: Project86 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!