View 5 Photos View 0 Videos Used Peterbilt Heater/AC Control Module, Part # Q21-6012 $799.99 USD (Used) Peterbilt HEATER/AC CONTROL MODULE - Part Number: Q21-6012, Software Revision: 2.10 For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS)... ConditionUsedFits To Make(s)PeterbiltPart NumberQ21-6012Stock NumberP-55634 MLS Number12349327CategoryHeater / AC Climate Control Parts Last Updated3/27/2026 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info