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Thread: heater troubles

  1. #1

    Default heater troubles

    intermittent problem - 2004 2500hd Silverado gas, heater blows cold air. Shift manual temp controls up and down a couple of times and warm air blows. What is the issue here?

  2. #2


    Probably the encoder motor on the hot/cold blend door is binding up. They aren't cheap.
    2002 Tahoe LS 4x4 5.3 Flex Corvette Servo AVS In-channels JVC KD-PDR80 BB Engine Tune Front Mounted Receiver
    1984 3500 3+3 Crew Cab 350 w/Edelbrock 600 700R4 w/Corvette Servo & manual TCC AVS Surface Mount JVC w/Sub

  3. #3


    It is the Temp Door Actuater, it is prolly shorted out, and yes they are not cheap by any means i had mine short out on my 04 1500 and still have yet to get it taken care of. I have been quoted anywhere from $800-$1000 from various dealerships and local shops.

    If anyone could help me find out where exactly the actuater is on the driver side it would be great help.

  4. #4


    disconnect your battery to reset the hvac modules. sometimes the actuators will "loose" the door positions. if that doesnt help you most likely need a new blend door actuator.

    price will depend on where the actuator is at and weather you have to pull the dash to get to it or not

    05 silverado shortbed

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