Check for obstructions to the
air flow through the heater — one of the few things in the heating system that I don't see on your list is the
cabin air filter, so confirm that it is not plugged.
2017 GMC Sierra 3500 SLE Leather Z71 Crew Cab Duramax Diesel Allison Transmission 6inch Lifted Monster 4x4
Do not make a $ 3K + mistake, B4 you buy a used truck demand to see shop bills & have the truck inspected by a 3rd party!STILL UNDER FACTORY WARRANTY * Repair Description: Total Invested = $ 847.48 * 10 Mile Road Test, 135 Point Inspection, Installed Tire Size Calibrator in Truck, Alignment, Replaced
Air Filter & Wiper Blades, Replaced
Cabin Air Filter, Filled Truck with Diesel Exhaust Fluid.Battery Condition Test: Good, Alternator Condition Test: GoodLabor time quoted by All Data Universal ShopKey