Heater Core: Service and Repair

Standard heater core removal:

Standard Heater
1. Drain cooling system.
2. Disconnect hoses from heater core. Plug hoses and heater core to prevent contamination and spillage of coolant.
3. Working from inside passenger compartment, remove heater core access cover-to-plenum chamber attaching screws and the access cover, Fig. 23.
4. Depress retainer clip at top of heater core, then pull heater core rearward with downward motion and remove from plenum chamber.
5. Reverse procedure to install.

Fig. 24 Auxiliary heater core removal:

Auxiliary Heater
1. Remove first seat behind driver, if equipped.
2. Remove auxiliary heater access cover attaching screws and the cover, Fig. 24.
3. Remove auxiliary unit floor duct attaching screw, push downward on joint where duct connects to auxiliary unit, then rotate and remove floor duct from vehicle.
4. Remove auxiliary heater cover assembly retaining screws, then separate cover from auxiliary heater.
5. Disconnect heater hoses from heater core, plug hoses and core to prevent spillage of coolant, then slide core and seal assembly out through slot in housing.
6. Reverse procedure to install.