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Posted on Jun 19, 2008

2004 GMC Siera Dual AC, One side works the other doesnt

I was driving along and suddenly the driver side vents are blowing hot air and the passanger side is still blowing nice amd cool.

Any thought?????

  • 2 more comments 
  • blueashboats Sep 01, 2008

    I have the same problem.

  • Anonymous Nov 13, 2008

    I have the same problem, although my passenger side is the hot one and driver's side blows as it should.  The stealership told me I need to replace both actuators to the tune of $1060.00

  • bill w May 11, 2010

    how do I fix it

  • Anonymous Mar 26, 2014

    Start with the water pump and is all ready been replaced, with the set of 60 degrees of temp. set and the blower all the way, blow hot air on the driver side and cold on the other side? is any idea was going on?

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  • Posted on Jul 10, 2008
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I coincidentally had the same problem today. Whats the a/c plenum and how can I take care of it?

A

Anonymous

Had the same problem/. it's the ac plenium

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Having problems with the vents when the AC is running. Drivers side blows hot air / passenger side is cold.

You have actuators which direct the air in the heater/vent/AC system. My first cars used metal cables, then came along vacuum line control and most now use electric control actuators. They control things such as how much air from outside the car come inside, air flow to windshield/floor or dash, control mix of air for temperature adjustment. Your problem more than likely actuator issue. You can try google vehicle year, make, model temperature different from ac vent, when search you can change wording. If vehicle is older and used vacuum lines could have line leak, my 2000 GM van once had vacuum line laying on engine melted line and leaked. My 13 Chrysler, I have changed 2 actuators they are controlled by electric and started clicking when they went bad.

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