Auxiliary Heater Core - Expedition EL, Navigator L

Auxiliary Heater Core - Expedition EL, Navigator L









Removal and Installation

NOTE: If a heater core leak is suspected, the heater core must be pressure leak tested before it is removed from the vehicle.

NOTE: It is not necessary to install the new heater core tubes contained in the heater core service kit unless there is evidence of damage to the heater core tubes. New O-ring seals must be installed any time the heater core tubes are detached from the heater core.

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Jacking and Lifting Service and Repair.

2. Drain the engine coolant. For additional information, refer to Engine Cooling Cooling System Draining, Filling and Bleeding.

3. Remove the RH quarter trim panel. For additional information, refer to Interior Trim and Ornamentation Quarter Trim Panel.

4. Position a suitable drain pan and disconnect the 2 auxiliary heater outlet and inlet line quick disconnect fittings at the floorpan connections to allow any residual coolant to drain from the auxiliary heater core.

5. Remove the heater core door screw.





6. Remove the 2 auxiliary heater core tube fitting clips.





7. Disconnect the 2 auxiliary heater core tubes.

1. Position the auxiliary heater core partially out of the housing.

2. Disconnect the auxiliary heater core inlet tube.

3. Disconnect the auxiliary heater core outlet tube.

- Discard the O-ring seals.





8. Remove the auxiliary heater core.

9. NOTE: Use only the O-ring seals contained in the auxiliary heater core service kit.

NOTE: Verify that the heater core tube fittings are completely seated in the heater core before installing the heater core tube fitting clips.

To install, reverse the removal procedure.

10. Fill the engine cooling system. For additional information, refer to Engine Cooling Cooling System Draining, Filling and Bleeding.