Lincoln 7L1Z-18476-B Core Assembly - Heater

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Take the vehicle to a dealer service department or automotive air conditioning shop and have the air conditioning system discharged. Disconnect the cable from the negative battery terminal. Drain the cooling system. Remove the instrument panel. Disconnect the heater hoses from the heater core inlet and outlet tubes at the firewall. Disconnect and plug the evaporator lines at the firewall. Plug the heater core tubes to avoid spilling any coolant during removal. Cap the evaporator lines to prevent the entry of dirt and moisture. Disconnect the main vacuum line and remove the plenum demister tube. Remove the two screws holding the bracket to the top of the heater core housing. Remove the screws and the heater core cover, then pull out the heater core, being careful not to tear the foam sealing material. When reinstalling the heater core in the housing, make sure the original foam sealing material is intact and in place. The remainder of the installation is the reverse of removal. Install new retainers and 0-rings on the hoses that connect to the heater core at the firewall. Fill the cooling system. Run the engine and check for coolant leaks. Have the air conditioning system charged and check for proper operation of the system. On some models of Navigator/Expedition vehicles, there is an optional heal/air-conditioning system located behind the left-rear interior trim panel, or right side panel on later Expedition/Navigator models. The assembly includes a blower, heater core and evaporator core. Removal and installation procedures are similar to the procedures for the standard heater core up front, although the rear unit is much more accessible.