Shop 2003 GMC Sierra 3500 HVAC Heater Core. 1999-02. 2003-07, w/o center console. All Models. All Models Std, Aux, Controls, Temp - OEM GMC Part # 89018297 (52473322)

HVAC Heater Core.
Dual Zone Climate Control. Exc.Air Cond. Exc.Custom Front Floor Console. For A/C Belt. For Primary HVAC. HVAC Heater Core.

HVAC Heater Core

1999-02. 2003-07, w/o center console. All Models. All Models; w/AC; w/o Console. All Models; w/o AC. Avalanche, Escalade EXT. Escalade ESV. FRONT 2000-02. FRONT 2003-06. FRONT, 2008-09. Silverado, Sierra Hybrid; w/Aux Temp Controls. Silverado, Sierra; w/Aux Temp Controls. Std cab. Tahoe, Yukon, Escalade. Yukon XL, Suburban.
Heater Core - Repair or Replace
Your vehicle’s heater core handles hot water from your engine’s cooling system and transfers the heat to the cabin in the form of comforting heat from your vents. A failed heater core can leak that water—which is also called coolant or antifreeze—onto the floor on the passenger side. If your needs to have the heater core replaced, it's a job best left to a trained technician.