Question about 2004 GMC Sierra

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2005 Yukon Denalli - Blow cold air out the drivers side

Car blows cold air out the drivers side and warm air on the passenger side. Problem is intermittent. I was fixed 10 months ago at the dealership and is happening again. Not covered under warranty.

Any thoughts

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The passenger side electronic controller is sensing the passenger side temperature is cooler than it really is, which causes the controller to increase the hot water flow to warm up the passenger area...any time you replace a battery or loose your charge, the HVAC module will need to be reset...Try this...
Remove your hvac fuse for 10 sec - reinstall fuse. Start engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" Recalibration of module will accure when power is lost (fuse pulled, battery changed or died) If hvac reset did not work you have a trouble code - reset BCM There are two ways to reset your body control module Go to the GENERAL Remove BOTH battery cables (for the sake of CAUTION remove air bag fuse and wait 5 MINUTES) Hold both cables together for 1 minute - drains KAM (keep alive memory). Put everything back together Start the engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" If you have no broken parts - system not default (normal operation)

If that works it just saved you 600 dollars...dealer costs to repair.

Good Luck...please rate me a fixya.

Posted on Jul 25, 2009

  • Anony2011 Jul 09, 2011

    THANK YOU!!!! The A/C was working just fine on my 2005 Yukon XL, then I stopped at a store. Came back to the car and no A/C. I followed many different fix-it steps and the thing that made it work again was your advice about removing the battery cables and holding them together. Saved me a trip to the repair shop!!!

  • Anony2011 Jul 09, 2011

    THANK YOU!!!! The A/C was working just fine on my 2005 Yukon XL, then I stopped at a store. Came back to the car and no A/C. I followed many different fix-it steps and the thing that made it work again was your advice about removing the battery cables and holding them together. Saved me a trip to the repair shop!!!

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