Defroster Valve Actuator Replacement for GMC Truck TopKick C-Series (Crew) C4/C5 2003

1. Remove the defroster grill. Refer to Defroster Grille Replacement .



2. Disconnect the vacuum hose (1) from the defrost actuator (2).
3. Depress the clip and remove the defrost actuator (2) from the heater assembly.

1. Install the defrost actuator (2) to the heater assembly.
2. Connect the vacuum hose (1) to the defrost actuator (2).
3. Install the defroster grill. Refer to Defroster Grille Replacement .