Shop 2004 Chevrolet Trailblazer EXT HVAC Heater Core. 4.2 LITER, REAR. 5.3 & 6.0 LITER, REAR. Envoy - OEM Chevrolet Part # 89023339

Auxiliary Heater Core. HVAC Heater Core.
For Auxiliary HVAC. HVAC Heater Core.

HVAC Heater Core

Fits Envoy, Envoy XL, Envoy XUV, Rainier, Trailblazer, Trailblazer EXT

4.2 LITER, REAR. 5.3 & 6.0 LITER, REAR. Envoy/Trailblazer.
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.