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Chevy Silverado and GMC Sierra Climate Control



  • As a follow up, I just got back from the dealership. I was 3,000 miles out of warranty and the cost to replace the resistor and wire harness was quoted at $340. When I asked for the number to the customer service rep because fried wiring is not normal wear the service writer had me speak to the service manager who stated that this is such a common problem that they have all the parts on hand to fix it and for "goodwill and to fix a known problem" they would fix it for free. One hour later I was down the road with it fixed.

    Thanks for the inputs.
  • I have a 2003 Gmc Sierra 1500 with dual heat control. The air conditioning works fine but when you slide the controls up to heat the heat only works on the drivers side and the passenger side still blows cold air. This happens whether or not the AC switch is on or off. Thanks in advance.
  • I was jumping another person's car and accidently got the cables on the wrong posts. When I started my p/u it only put out hot air. I talked to the Chevy dealer and he said they would have to re-program the a/c computer. I thought if it was like other computers I would just re-boot it. I unhooked the negative cable from the battery for a few seconds and reconnected. It fixed it.
    Only thing is, my a/c will not put out very cold air. It has a good charge of freon (had it checked) and I suspect the cold/hot air mixing valve.

    How do I check it for sure?
  • my 2006 sierra has a dead blower motor at 50,000 and is out of warranty & the part is not available at the GMC distribution center.

    others have the same problem?
  • I have 03 GMC 2500 HD with the digital climate control. My problem is that i can only get hot air when its set on 90 degrees, anything below 90 is cold air. Any suggetions would be appreciated.
  • I had the same problem; replaced the burnt resistor and wiring harness ($170); called GM Customer Service and was told that I needed an official diagnosis from the dealer in order to have a Dist. Rep. call me to discuss the problem.
    Mine is a 2006 GMC Sierra with 50,000 miles/ no warranty.
    The wires/connectors that come out of the fan/ resistor box by fan look burnt if you look closely.
    My dealer also had the resistor/wiring harness in stock.
    I commend your dealer for the fair "goodwill" N/C repair.
    email your dealer/ service manager contact?
  • I have a 2007 (NBS) Silverado 1500 with digital climate control. I was into the under the hood fuse box searching for a switched circuit and didn't think to disconnect the battery until I had been poking around for awhile. Now, the heater blower works in all settings ( auto, manual, defrost, etc.), but no heat regardless of how high I set the temperature.

    Will appreciate any help, ideas, suggestions...
  • Not sure what the original problem was but if you disconnected the battery you could have flipped the computer, which I had done.

    Turn off you climate control, then try disconnecting the battery again for 5 - 10 minutes. Then put it back on. Just disconnecting doesnt reset the computer it takes a while of no power.

    With a 1500, I imagine you only have 1 battery but if you have 2 make sure to disconnect both.
  • tthoreso

    When I left work at noon yesterday, I discovered that the remote start was also inoperable. I did as you suggested, turned off the HVAC and disconnected the battery for about 15 minutes. That restored the remote start but not the HVAC.

    The original problem was my own stupidity! I removed the under hood fuse box without first disconnecting the battery (I certainly know better). Since resetting the computer by disconnecting the battery didn't fix the problem, I suspect that I have fried something in the HVAC circuitry. Have any suggestions short of taking it to the dealer?

    Thanks for your help
  • dualsduals Posts: 3
    I shorted out my heater control last night. Is there a quick fix or a location of a relay or fuse that I can check.


  • dualsduals Posts: 3
    It is a 96' model.
  • dualsduals Posts: 3
    Mine does the same thing. Any help?
  • the weather just turned bad, like 20 below 0 and now the heater motor runs all the time, whether the key is in the ignition or not. Had to pull the fuse for the heater so it won't run my battery down at nite. Any body have an idea what could cause this?
  • although there are many posts similar to my problem i didnt see any that were exactly the same so i figured before i started ripping stuff apart i would see if anyone could help me. Ive got a 2006 GMC 2500HD standard work truck. it has the manual dual climate control and it stopped working the other day. i snow plow so it worked all night but after turning the truck on after gassing up i no longer got any forced air. i need to get this fixed fast because i NEED the defroster. all my fuses checked out fine (2 under the hood and 2 on the left side of the dash) and the lights on the ac and stuff work i just dont get a fan i guess, no matter the setting. ANY help with this would be greatly appreciated!!
  • 2006 gmc sierra 1500 slt climate control fan switch only works up to level 4 thought the problem was blower motor resistor, replaced it and the plug, still doesnt work on level 5, not sure what to do next? any ideas?
  • I shut off the climate control, unhooked the battery and the fan continue to run when I put the fuse back in. Any help?
  • does antone know if you can change the manual heater controls with then electric auto climate control in a 08 1500
  • My Sierra 5.3 defrostor vent seems to be too small to properly heat the entire windshield. The vent seems too small. Has anyone encountered this problem? The older styles have three vents compared to the one vent on the current models.
  • air only comes out of defroster no matter where the knob is, also makes no difference if its on heat or a/c. sounds like the air is coming out of the back of the dash itself. Already tried resetting the computer and changing the fuses. I can not find an air leak in the vent hoses for the vents in the dash. Anyone have any other ideas of what or how to fix this?
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