Envoy 2WD V6-4.3L VIN W (1998)
The defroster valve actuator (4) is located on the bottom left side of the heater/vent module.
Mode Valve
The mode valve actuator (5) is located on the top left side of the heater/vent module.
Temperature Valve
The temperature valve actuator is located on the top right side of the heater case.
