Question about 2004 Chevrolet Silverado 1500 Crew Cab

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2004 chevy silverado z71 quad cab. will not cool need wiring diagram. I replaced the heater core and now the mix door will not open when air conditioning selected on. I have confirmed all wiring connections are secured. Tech 2 reads no voltage to mix door actuator. cannot find free wiring diagrams on-line to print out. I have serviced air conditioning to proper pressure readings. any suggestions

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  • Scott Bartos Jul 08, 2010

    my mix door actuator is on top of the plenum. are you saying the actuator on the bottom by the blower motor controls the door actuator? do you know where I can download a wiring diagram?

  • Scott Bartos Jan 01, 2012

    I to replaced my heater core and had the same issue. remove the top of the dash and remove the screws holding the plastic ducts in place to gain acces to the blend door actuator. inspect the open close markings on the side of the case. you will notice that the shaft indicator probably shows that it has traveled farther then the marks. what you have to do is remove actuator,split the case halves. reposition the gears to close to center as possible. reassmble acuator and install. and test. what happens is the actuator goes out of the travel range and your airconditioning/heater control locks the actuator out.


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1994 chev 1500 need to know what wire goes where

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The door you are talking about has an actuator motor on the bottom of the blower box,look in the middle,under the dash,that will be the one,make sure it is plugged up,if not,it may need replacing.

Posted on Jul 08, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 08, 2010

    The door you are talking about has an actuator motor on the bottom of the blower box,look in the middle,under the dash,that will be the one,make sure it is plugged up,if not,it may need replacing.


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