Contents Wiring diagrams Section: Heater All sections

Heater System: Overview GMC Envoy I

DESCRIPTION

System blends heated outside air with cooler outside air to obtain desired temperature. Major components of the system are blower motor, air inlet assembly, heater air distributor assembly, and heater control panel.

Temperature control door is controlled by an electric actuator motor. Vacuum actuators control mode valves to regulate flow of air through heater unit.