Question about GMC Sierra 1500

3 Answers

My 2005 GMC Sierra Truck with dual zone AC & Heating controls; the passanger side with the control all the way down to coldest setting the air coming out switches from cold to warm air while the drivers side stays cold when set to the coldest setting. I purchased a Hayes Repair manual but there is very little on AC problems. Any Ideas?????????? Jim

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  • 10 more comments 
  • Jim Grundy Oct 03, 2010

    Is this something an owner could replace or would it have to go into a shop. any idea of the cost of such a unit. How is the board lacated or how do I get to it? Jim

  • Jim Grundy Oct 03, 2010

    What is your expertise background. The reason I ask is the sales pwerson at Auto Zone showed me a mechanical valvue. I don't mean to offend you but the cost of the part is pretty high, also my 2005 GMS has sliders the move up and down as you want to regulate the temperature. Jim

  • Jim Grundy Oct 03, 2010

    All that I know for sure is that the 2 slides move up and down. one controls driver side the other slide is the passanger side. I thought I stated that at the start. My GMC has a lot of bell and whistles, but the temp control slid for each zone. Can you tell me what your knowledge based on?

  • Jim Grundy Oct 04, 2010

    I have a 2005 GMC 1500 Sierra 4x4 truch w 5.3L engine. The Ac controls are a dual zone cooling that has two slides for temperature control for each side of the truck. The passanger side now goes from cold to warm at will when the slider is set all the way down for the coldest saetting.I have just shut off the middle vent that blows yhe mixed air to deal with the problem for now. Thw Hayes manual does not mention a solution only how to change out the blower motors

  • Jim Grundy Oct 04, 2010

    This sounds like a solution, but is this a job I can do my self? I know a fair amount about working on vehicles and I know the difference between a left or right handed screwdriver. Seriously, are there instructions somewhere on how to get this replaced and put back together? I had been told earlier that the electric motor that controls the flap was the problem and I would have to replace the controling AC board to fix the problem. Around $ 350 just for the part. What is your background, I don't mean to offend but I just want to follow the most reasonable solution, and yours sounds most likely to me. Jim

  • Jim Grundy Oct 04, 2010

    Thanks for the fast reply. Is this a pull and replace job? The part shows at autozone for $139.99, is that about the right cost for the part from your experiences with this problem? I fell better working with you than the previous helper. He would never give me any reason to believe he knew what he was talking about, he would not tell me about his expertise, thank you for that. Again is this just a pull and replace operation for me. Jim

  • Jim Grundy Oct 04, 2010

    This is what I've been looking for. Please forward the procedure. Jim

  • Jim Grundy Oct 04, 2010

    I believe your idea will work. Could you send the procedure?

  • Jim Grundy Oct 04, 2010

    Is there a passenger side actuator and a driver side unit?

  • Jim Grundy Oct 04, 2010

    Thanks, When I can get yhe $ 135 together I do your fix. Thanks, Jim

  • DARWIN RYMAN
    DARWIN RYMAN Apr 29, 2014

    THAT INFORMATION IS VERY HELPFUL. IF YOU CAN SEND THE REPLACEMENT PROCEDURE, I WOULD APPRECIATE IT

  • David Burbee
    David Burbee Apr 29, 2014

    Send an e-mail to saailer@ec.rr.com and I'll send you the pdf's for replacement

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  • GMC Expert
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Hello! There are two door actuators that control driver/passenger A/C...The Passenger Door Actuator Is defective...It is a common failure on your vehicle...Replacing the Actuator yourself will save you about $400...The average cost at an auto parts store is $135...
Here is a picture of the Actuator...If you intend on replacing it yourself, send a comment and I'll send the procedure...

My 2005 GMC Sierra Truck - 8332a2f.jpg8fc5e5a.gif

Guru..............Saailer

Posted on Oct 04, 2010

  • 4 more comments 
  • David Burbee
    David Burbee Oct 04, 2010

    Hello! I sent the left side actuator location drawing...Should be the Right Side Actuator location (passenger side)...



    CAUTION...Do not apply power to the actuator when it is removed from the HVAC unit.....

    1...Remove instrument hush panel...2...disconnect Actuator connector...3...Remove Actuator mounting screws and Actuator...4...Install in reverse...5...Calibrate Actuator as follows...Turn ignition key off...Remove HVAC1 fuse (10A) from interior fuse box...Wait 90 seconds...Install fuse...

    Guru....Saailer

  • David Burbee
    David Burbee Oct 04, 2010

    Hello! Yes there is one on both sides...I sent the second diagram with the test procedure about 3 hours ago...I'll send them again...This is the passenger side...



    This is the drivers side...



    CAUTION...Do not apply power to the actuator when it is removed from the HVAC unit.....

    1...Remove
    instrument hush panel...2...disconnect Actuator connector...3...Remove
    Actuator mounting screws and Actuator...4...Install in
    reverse...5...Calibrate Actuator as follows...Turn ignition key
    off...Remove HVAC1 fuse (10A) from interior fuse box...Wait 90 seconds...Install fuse...


    Both Actuators are the same part #...

    Guru....Saailer

  • albano Jul 20, 2012

    can u tell me more please how to change this

  • james l shepherd Nov 14, 2012

    do you have a diagram that show both actuators in position

  • David Burbee
    David Burbee Nov 14, 2012

    Its been awhile...Procedure is long...Yuo have the option of giving me your e-mail and I'll send it to you or you can choose to purchase a Haynes Manual for $20...Your e-mail will be kept pricate....Just send a message to: saailer@ec.rr.com

  • David Burbee
    David Burbee Nov 14, 2012

    You can send me a message so I'll have your e-mail and then return the procedure...saailer

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  • GMC Master
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The temperature of the air is adjusted by a flap on the air ducts inside the dash. That flap is controlled by an electric motor that is itself controlled by the AC controller board. In your case that board is malfunctioning and must be replaced.

Posted on Oct 03, 2010

  • 1 more comment 
  • Azrael SRL Oct 03, 2010

    Yes, you can do the entire job yourself - practically it's just replacing the center dash control board(the one with the buttons). The Haynes manual has in it all the instructions on how to take it out.
    The board itself will cost you between $100 for one from a breaker yard (even cheaper if you haggle) to $350 for a brand new one.

  • Azrael SRL Oct 03, 2010

    You should have specified that you have the mechanical (non automated) version , not the electronic one (with the lcd screen) and electronic control board - the cheaper trim version.



    In that case the problem is mechanical - the levers on the dash transmit the command directly to the flap thru a cable. That cable is broken or detached. Replacing the entire temperature lever mechanism will cost you around $50 and will take less than an hour.

  • Azrael SRL Oct 04, 2010

    I'm an automotive engineer, at the present working as a car mechanic. What is your level of expertise?

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The blend door actuator is stuck open or the little worm gear on the motor is broken. You will need to replace it to get it working right again. Click on the link below to view the replacement part:

http://www.autozone.com/autozone/parts/2005-GMC-Sierra-1500-4WD/Blend-Door-Actuator/_/N-jn30pZ9pelb

Click on this link to view a forum on related topic:
http://www.gm-trucks.com/forums/index.php?s=10be1e47f1c5e8be44980b55d3cba974&showtopic=104373

Posted on Oct 04, 2010

  • Anonymous Oct 04, 2010

    I have worked seven years in a gas station automotive repair garage and almost two years with Fixya. I have seen this problem many times before and 100% sure the failed part is the blend door motor. It is located under the dash and just to the right of your gas pedal

  • Anonymous Oct 05, 2010

    I had the answer right the first time and you gave me two thums up? I See that I DID know what I was talking about.

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