Question about 2004 GMC Sierra

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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?????

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  • 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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I coincidentally had the same problem today. Whats the a/c plenum and how can I take care of it?

Posted on Jul 10, 2008

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

Posted on Jun 26, 2008

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