Heater Case

4.2L, rear. 5.3 & 6.0L, rear. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type

Expansion Valve

4.2L, rear. 5.3 & 6.0L, rear. Responsible for removing pressure from within the liquid refrigerant, which alters the state from a liquid, to a vapor in the evaporator This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type

HVAC Heater Core Seal, Front

4.2L, front. 5.3 & 6.0L, front. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

5.3 & 6.0L, rear. 4.2L, rear.

Actuator

4.2L, rear, temp. 5.3 & 6.0L, rear, temp. 4.2L, rear, mode. 5.3 & 6.0L, rear, mode. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

Envoy/Trailblazer. 4.2L. 5.3 & 6.0L.