Question about 2004 Chevrolet Avalanche

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04 Chevy Avalanche Driver's heater blowing cold all the time

Hi!
I have a 2004 Chevrolet Avalanche 4x4 Auto with the dual-zone heat and cooling in the front. The passenger side works just like it is supposed to, but the driver's side ONLY blows out cold air. Anyone have this problem or know of what might cause it? Any help would be appreciated!

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  • darrinnm Oct 21, 2008

    Okay, so I tried that and it still does the same thing. How tough is an actuator to replace? I am fairly competent mechanically...Is this a project I could take on? Any idea where I could learn more about it?

  • chuckasmith Oct 28, 2008

    Odd about the timing - but I have the exact same problem with my 2004 Avalanche - seems to have just started this issue this week (or might be the first time that I have used the heater)....
    The passenger side heats fine, but the drivers side & back only blows cool air. I'll try the disconnect the battery solution first and post back how/if that worked.


  • downeyt Nov 08, 2008

    I have the same problem on my 2007 Avalanche. The only difference, is my heater blows out cool air from both sides of the cabin at around 80 degrees. If I crank up the heat to 90 degrees, the heater blows out hot air. Took it straight away to the dealer and he wanted to charge me 98$ to look at it and if he had to replace the actuators, that they would be around 240$ each plus labor.

  • Anonymous Dec 12, 2008

    My 04 Avalanche also won't blow hot air out any of the dash vents, no matter what you set the temp at. It blows cold air out of the windshield vents only. I tried unhooking the battery for over 5 minutes and did not make any difference.
    If it is the mode actuator, how hard is it to replace?


  • drewgarber Jan 06, 2009

    I have a very similiar issue on a 2005 Chevrolet Avalanche Z71 with Automatic Climate control. Temperature adjustment is not working correctly. Blows cold air most of the time and will get hot if cranked up to 90 degrees and then you feel like you are on fire. Thought that it was a thermostat problem or water pump issue. But this makes more sense, being a Electronic climate control issue.

  • alan1747 Apr 11, 2009

    2004 Tahoe A/C works fine, but no heat from either left or right side unless it is turned up to 90 (max heat). Either side will work only when set at 90

    You can hear something when going from 89 to 90 or 90 down.

    Tried disconnecting battery and heater control wires at dash.

  • Anonymous Mar 14, 2014

    My 2006 avalanche heater will not blow out any heat

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Your mode actuator is stuck. try unhooking battery for a few minutes when you hook back up actuators will do a relearn.if this does not work will need to have replaced

Posted on Oct 20, 2008

  • TripleTauto
    TripleTauto Oct 21, 2008

    your drivers side actuator will be on side of air box on left side it should have a big white cam on it might have to pull center console if you have one to gain access. be sure when installing it goes back on as came off there is a lever that hooks in the cam as well

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Probably the blend door .

Posted on Jan 03, 2015

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