HVAC control problem

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Thread: HVAC control problem

  1. #1
    6.2 Liter LS3 V8 drew630's Avatar
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    HVAC control problem

    The HVAC system in my truck goes from blowing A/C cold air to straight heat in either the drivers or passenger sides vents without me changing the controls, lol. For example: Today I am coming back from class sitting in traffic. Its extremely hot outside so I have the A/C cranked all the way up (Temp. set on 60). All of a sudden without touching any of the HVAC controls, heat starts coming out of the driver sides vents, pure heat. The passenger side though is still blowing cold, A/C, air. It has done this randomly (very randomly) basically since I have owned the truck (Oct. 2003). I haven't taken it to the dealer basically because it never does it when I going to the dealer for an oil change and when it does do it, I don't have time to go straight to the dealer. Its really not a big deal (because it only does it maybe once a month or so), I am just mostly wondering what is causing this to happen.

    BTW, to get it to work right again, I either have to cut the system off and wait a few minutes before turning it back on or restart the truck.
    My Current Ride: 2004 Z71 Silverado
    Family: Father 2009 Enclave CXL, Mother 2007 Solstice & Bro 2004 Z71 Silverado

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    2.4 Liter SIDI ECOTEC camaro75's Avatar
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    Re: HVAC control problem

    Do you have electronic climate control or just the basic?
    04 YELLOW Z71 COLORADO CREW 116,000 mi
    04 WHITE YUKON XL DENALI 74,000 mi
    79 Red and white K5 Blazer 244,000 mi

    Past rides,

    75 Chevy Camaro 223,000 mi Sold
    77 Cadillac Coupe Deville 291,000 mi (Donated)
    92 Chevy Corsica 152,000 mi Sold
    89 Chevy Silverado Reg cab 163,000 mi Sold
    00 Chevy Monte Carlo SS 76,000 mi Traded
    03 Silverado 35,000 mi Traded
    03 Buick Century 62,000 mi traded
    04 SILVER Z71 BURB (Totaled 6/01/07) R.I.P 38,000 mi

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    6.2 Liter LS3 V8 drew630's Avatar
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    Re: HVAC control problem

    Quote Originally Posted by camaro75
    Do you have electronic climate control or just the basic?
    Electronic Climate Control
    My Current Ride: 2004 Z71 Silverado
    Family: Father 2009 Enclave CXL, Mother 2007 Solstice & Bro 2004 Z71 Silverado

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    2.4 Liter SIDI ECOTEC camaro75's Avatar
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    Re: HVAC control problem

    I had the same thing happened on my burb with electronic cc, the dealer said it was a bad switch (don't remember what it was called). I couldn't get it to do it for them either but they still researched it, replaced the switch and it worked fine after that.
    04 YELLOW Z71 COLORADO CREW 116,000 mi
    04 WHITE YUKON XL DENALI 74,000 mi
    79 Red and white K5 Blazer 244,000 mi

    Past rides,

    75 Chevy Camaro 223,000 mi Sold
    77 Cadillac Coupe Deville 291,000 mi (Donated)
    92 Chevy Corsica 152,000 mi Sold
    89 Chevy Silverado Reg cab 163,000 mi Sold
    00 Chevy Monte Carlo SS 76,000 mi Traded
    03 Silverado 35,000 mi Traded
    03 Buick Century 62,000 mi traded
    04 SILVER Z71 BURB (Totaled 6/01/07) R.I.P 38,000 mi

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    GMI Staff Member Premium Member shadams's Avatar
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    Re: HVAC control problem

    Software update, just did one today, check it out:

    Condition
    Some customers may comment on one or more of the following concerns:

    • Intermittent ticking/clicking noise from the instrument panel.

    • Recirculation mode does not work or Air Conditioning (A/C) system performance is poor during high ambient temperatures.

    • Unable to control the driver side temperature.

    • Unable to control the passenger side temperature.

    • Unable to change the front system modes.

    Cause
    This condition may be caused by the Heating, Ventilation and Air Conditioning (HVAC) actuators that may hunt for the correct commanded position. This cycling may cause a clicking or ticking noise.

    An overtravel of the HVAC system control doors may cause one or more of the concerns listed above. If an overtravel occurs, a Diagnostic Trouble Code (DTC) will be set, and the door will go to a preset default position. When a system door defaults, that door will stay at the default position until the DTC is cleared. After the DTC is cleared, the door will operate properly until the overtravel condition re-occurs.


    Take it in to have it checked, have them reference bulletin #06-01-38-003
    "Contrary to common belief, planning is complicated and is not run by complete idiots, so you'll just have to trust that the decisions were made on good information that's not made available to you."

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    7.0 Liter LS7 V8 Premium Member
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    Re: HVAC control problem

    Subject:HVAC System Cannot Be Controlled Or Defaults To Defrost Mode (Repair HVAC Actuator Harness) #04-01-38-008 - (06/17/2004)


    Models:2003-2005 Cadillac Escalade, Escalade ESV, Escalade EXT
    2003-2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe
    2003-2005 GMC Sierra, Yukon, Yukon XL


    Condition

    • Some customers may comment that they cannot control the HVAC (heating, ventilation and air conditioning) system. Others may comment that the HVAC system defaults to the Defrost mode.
    • Technicians may find that the following diagnostic trouble codes have set:
    B0229 Recirculation Actuator
    B0414 Left Air Temperature Actuator
    B0424 Right Air Temperature Actuator
    B3770 Mode Actuator
    Cause

    The HVAC actuator harness may contact a sharp edge on the instrument panel support brace, causing a rub through condition and a ground out of the actuator control and/or feedback circuits.
    Correction




    Locate the HVAC actuator harness contact point shown by the arrow in the above illustration. The illustration is of the instrument panel with the instrument panel compartment door opened and folded downward. The actuator harness is located in the left side of the opening in the instrument panel.
    Technicians are to inspect the HVAC actuator harness for contact with the instrument panel support brace. Repair any damage to the actuator harness wiring and install protective plastic conduit over the harness. Install friction tape over the sharp edge of the instrument panel brace. Clear the diagnostic trouble codes and verify proper HVAC system operation.
    Warranty Information

    For vehicles repaired under warranty, use:
    Labor Operation
    Description
    Labor Time
    N6642
    Wiring And/Or Connector - HVAC System - Repair Or Replace
    Use applicable labor operation time.
    Last edited by GMCSonoma; 06-22-2007 at 04:04 PM.

  8. #7
    6.2 Liter LS3 V8 drew630's Avatar
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    Re: HVAC control problem

    Quote Originally Posted by camaro75
    I had the same thing happened on my burb with electronic cc, the dealer said it was a bad switch (don't remember what it was called). I couldn't get it to do it for them either but they still researched it, replaced the switch and it worked fine after that.
    How much did the new switch cost or was the Burban under warranty?
    My Current Ride: 2004 Z71 Silverado
    Family: Father 2009 Enclave CXL, Mother 2007 Solstice & Bro 2004 Z71 Silverado

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    GMI Staff Member Premium Member shadams's Avatar
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    Re: HVAC control problem

    If they replaced anything, it was more than likely the temperature door actuator. I have replaced actuators, and done software updates, and both for that same problem, but if it is not really limited to one side than I would bet the software would fix it.

    The info GMCSonoma posted is also a possibility.
    "Contrary to common belief, planning is complicated and is not run by complete idiots, so you'll just have to trust that the decisions were made on good information that's not made available to you."

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    2.4 Liter SIDI ECOTEC camaro75's Avatar
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    Re: HVAC control problem

    Shadams is right, that's what it was. Mine was under warranty.
    04 YELLOW Z71 COLORADO CREW 116,000 mi
    04 WHITE YUKON XL DENALI 74,000 mi
    79 Red and white K5 Blazer 244,000 mi

    Past rides,

    75 Chevy Camaro 223,000 mi Sold
    77 Cadillac Coupe Deville 291,000 mi (Donated)
    92 Chevy Corsica 152,000 mi Sold
    89 Chevy Silverado Reg cab 163,000 mi Sold
    00 Chevy Monte Carlo SS 76,000 mi Traded
    03 Silverado 35,000 mi Traded
    03 Buick Century 62,000 mi traded
    04 SILVER Z71 BURB (Totaled 6/01/07) R.I.P 38,000 mi

  11. #10
    6.2 Liter LS3 V8 drew630's Avatar
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    Re: HVAC control problem

    GMCSonoma:
    So all I need to do is pull out the controls from the dash and tape up the wires and the metal brace to fix it?
    My Current Ride: 2004 Z71 Silverado
    Family: Father 2009 Enclave CXL, Mother 2007 Solstice & Bro 2004 Z71 Silverado

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    Re: HVAC control problem

    Quote Originally Posted by drew630
    GMCSonoma:
    So all I need to do is pull out the controls from the dash and tape up the wires and the metal brace to fix it?

    Look at the last sentence under the last big pic...

  13. #12
    6.2 Liter LS3 V8 drew630's Avatar
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    Re: HVAC control problem

    Quote Originally Posted by GMCSonoma
    Look at the last sentence under the last big pic...
    Ahh, so in other words its going to cost money. If I leave it alone will it damage anything in the long run? I mean I can deal with it going into defrost mode once a month but I will fix if not fixing it will result in a bigger problem later on.
    My Current Ride: 2004 Z71 Silverado
    Family: Father 2009 Enclave CXL, Mother 2007 Solstice & Bro 2004 Z71 Silverado

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    Re: HVAC control problem

    Quote Originally Posted by drew630
    Ahh, so in other words its going to cost money. If I leave it alone will it damage anything in the long run? I mean I can deal with it going into defrost mode once a month but I will fix if not fixing it will result in a bigger problem later on.

    No-no...this you can do, inspect if that's the case...

    Locate the HVAC actuator harness contact point shown by the arrow in the above illustration. The illustration is of the instrument panel with the instrument panel compartment door opened and folded downward. The actuator harness is located in the left side of the opening in the instrument panel.
    Technicians are to inspect the HVAC actuator harness for contact with the instrument panel support brace. Repair any damage to the actuator harness wiring and install protective plastic conduit over the harness. Install friction tape over the sharp edge of the instrument panel brace.

  15. #14
    6.2 Liter LS3 V8 drew630's Avatar
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    Re: HVAC control problem

    Where is the instrument panel compartment door at?
    My Current Ride: 2004 Z71 Silverado
    Family: Father 2009 Enclave CXL, Mother 2007 Solstice & Bro 2004 Z71 Silverado

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    Re: HVAC control problem

    Glove box?????????????

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