Lincoln 6E5Z-18476-BA Core Assembly - Heater

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This is a difficult procedure for the home mechanic, involving numerous hard-to-find fasteners, clips and electrical connectors. First, have the air conditioning refrigerant recovered at a dealer service department or air conditioning shop. Then, disconnect the cable from the negative battery terminal. Drain the cooling system. Disconnect the heater hoses from the heater core inlet and outlet pipes at the firewall and disconnect the thermal expansion valve and the two refrigerant pipes. Remove the instrument panel. On V6 models, remove the lower cowl grille panel to access some HVAC unit fasteners. Tag and disconnect the cables (if equipped) and electrical connectors from the HVAC unit. Remove the mounting fasteners. The heater core is in the right half of the HVAC unit, above the blower motor housing. Remove the heater core cover screws and pull the heater core out of the housing. Installation is the reverse of removal. Don't forget to reconnect the heater core inlet and outlet hoses at the firewall. Use a new gasket where the two air conditioning pipes meet the expansion valve at the firewall. Refill and bleed the cooling system. Have the refrigerant recharged.