Ford F5TZ-18476-A Core Assembly - Heater

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To replace the heater core on 1994 and earlier models, start by disconnecting the cable from the negative battery terminal and draining the cooling system. Loosen the clamps on the heater hoses at the engine compartment side of the firewall, twist and separate the hoses from the heater core tubes, and plug or cap the tubes. In the passenger compartment, remove the four screws securing the heater core access cover to the plenum assembly. Carefully pull the heater core down and to the rear to remove it. Installation is the reverse, ensuring proper filling of the cooling system and checking for leaks. Installation is the reverse of removal. Installation is the reverse of removal. Note: The procedure for 2001 and later models is challenging and may be best handled by a professional due to the complexity of removing the instrument panel.

To replace the heater core on 1994 and earlier models, start by disconnecting the cable from the negative battery terminal and draining the cooling system. Loosen the clamps on the heater hoses at the engine compartment side of the firewall, twist and separate the hoses from the heater core tubes, and plug or cap the tubes. In the passenger compartment, remove the four screws securing the heater core access cover to the plenum assembly. Carefully pull the heater core down and to the rear to remove it. Installation is the reverse, ensuring proper filling of the cooling system and checking for leaks. Installation is the reverse of removal. Installation is the reverse of removal. Note: The procedure for 2001 and later models is challenging and may be best handled by a professional due to the complexity of removing the instrument panel.

The heater circulates engine coolant through a small radiator, known as the heater core, located in the passenger compartment. Air is drawn in through an opening in the cowl and then blown by the blower motor through the heater core to absorb heat. This heated air is mixed with varying amounts of unheated air to control the temperature. The warmed air is then blown into the passenger compartment. Various doors in the heater manage the flow of air to the floor and through the instrument panel louvers and defroster outlets.

Allow the cooling system to completely cool down. Using a thick cloth for protection, turn the radiator filler cap to the first stop. Step back and let the pressure release. Once the pressure has been released, completely drain the cooling system. Working within the engine compartment, loosen the clamps on the heater hoses at the engine compartment side of the firewall. Disconnect the heater hoses from the fittings at the firewall. Twist the hoses and carefully separate them from the heater core tubes. Plug or cap the heater core tubes to prevent coolant from spilling into the passenger compartment when the heater core is removed. Place a plastic sheet on the floor of the vehicle to prevent stains if the coolant spills. On 2011 models, remove the air conditioning evaporator. Remove the instrument panel. On 2001 and later models, remove the PCM, the PCM heat sink, and ground strap. Remove the heater plenum chamber. Remove the heater core cover, if equipped. Separate the heater core from the heater plenum chamber. Installation is the reverse of the removal procedure, with the following additions: Fill the cooling system. Run the engine, check for leaks, and test the heater.

Remove the four screws securing the heater core access cover to the plenum assembly, then carefully pull the heater core to the rear and down and remove it from the plenum assembly.

The heater circulates engine coolant through a small radiator, known as the heater core, located in the passenger compartment. Air is drawn in through an opening in the cowl and then blown by the blower motor through the heater core to pick up heat. This heated air is mixed with varying amounts of unheated air to regulate the temperature. The warmed air is then blown into the passenger compartment. Various doors in the heater control the flow of air to the floor and through the instrument panel louvers and defroster outlets.