Rear ac and heat doesn't work on 2006 yukon xl denali

Asked by Jul 18, 2014 at 05:12 PM about the 2006 GMC Yukon XL Denali 4WD

Question type: Maintenance & Repair

I changed the rear and front control units, checked relay for front ac (can't find the rear ac relay) front ac works . Used direct power to blower, it works. Where is the rear relay located for the rear ac and heat blower? What else can it be?

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