Ford H2MZ-18476-X
Heater Core, Rear

A pressure leak test should be your first step when servicing the heater core when a leak exists. Start the heater core maintenance by removing both components together with the evaporator core housing followed by disassembly of two left-hand floor duct screws and the left-hand floor duct. The starting point of heater core servicing is to remove both right-hand floor duct screws before removing the right-hand floor duct. Perform the removal of housing brace screws alongside housing brace and screws securing the three housing braces. The first step is to disconnect the heater tube cover screws and after that disconnect the heater tube cover and heater tube seal. The removal procedure starts with handling the heater core cover screws until you extract both the cover along with the heater core. Reverse the steps of removal to reinstall the components as the final step of the service.

A proper servicing of the auxiliary climate control heater core begins with draining the cooling system. Commence by removing trim panels before performing a hose disconnect procedure on the rear heater hoses. Start by disconnecting the connector of the rear blend door motor followed by removing its screws. You should start by taking away the bolts from the rear heater core cover followed by pulling out the core from its housing without any coolant dripping into your car. The installation process requires reversing the steps for removal and the application of MERPOL(R) Ford specification ESE-M99B144-B or plain water for coolant hose lubrication when needed.

Initial steps in servicing the auxiliary heater core should start with a leak test when there are suspicions about leakage before the removal process begins. The service begins by taking off the LH quarter trim panel before following a certain sequence for component removal steps. Before removing heater hose clamps always place heater core tubes above an appropriate drain pan which will stop coolant from entering the vehicle. Detach the heater hoses from the heater core component. Complete engine cooling system filling must follow the installation process.

Begin auxiliary heater core service operations by setting the vehicle on a hoist with Push-button selector switched to NEUTRAL position. A suitable tool should clamp off the underbody heater hoses at their floorpan bracket. The service should follow the component removal sequence found inside the illustrations and tables. Item 4 features its screw together with its line bracket kept within the vehicle above the floorpan line bracket. Reverse the unmounting instructions while performing the installation before filling the engine cooling system. Engine damage prevention requires performing complete fill and bleed procedures when draining the engine block or front or rear heater cores while coolant hose lubrication should include plain water if needed.

A pressure leak test should be performed to check for leaks before servicing the heater core. The service process begins with removing both heater core and evaporator core housing from the vehicle. First remove the two screws which secure the left-hand floor duct before dissembling the LH duct assembly. Remove the two screws from the right-hand (RH) floor duct followed by removing the floor duct itself. Start by removing the housing brace using three screws followed by separation of the housing brace. Begin by disassembling the heater tube cover through screw removal of its three screws before moving to uninstall the heater tube cover. The thermal tube seal should be taken out first before the removal of the heater core cover through four screws securing it. Finally, remove the heater core. During installation the heater core should follow the order of removal steps in reverse.

Remove the plenum chamber top by unscrewing the 13 screws.

Place a gasket between the housing and cover.

Remove the heater core and evaporator core housing.

Lower the glove compartment door by disengaging the stops.

Reverse the removal procedure.

Clamp off and disconnect the heater water hoses, then remove the quick disconnect clamps from the heater core.

Ensure safety by not opening the cooling system while it is hot or the engine is running, as this may cause personal injury.

Lower the glove compartment door by disengaging the stops.

Remove the 4 line bracket screws and then the line bracket itself.

First, remove the third row seat and position aside the right-hand rear quarter trim panel.

Conduct a pressure leak test.

Position the vehicle on a hoist with it in NEUTRAL.

Reverse the removal procedure.

Release the clamps and disconnect the hoses before removing the auxiliary heater core.

The heater hoses.

It must be leak tested before removal.

Remove the three screws from the auxiliary heater core cover.

Reverse the removal procedure.

Remove the bolts for the support brace.

Reverse the removal procedure, ensuring to lubricate the coolant hoses with MERPOL(R) that meets Ford specification ESE-M99B144-B or use plain water if necessary.

Remove the two auxiliary line floorpan bracket nuts and the line bracket.

Perform the Heater Hose Coupling Disconnect Procedure.

Reverse the removal procedure.

Disconnect the vacuum line.

Tighten to 8 Nm (71 lb-in).

Disconnect the ground terminal bolt and remove the heater core and evaporator core housing.

Disconnect the vacuum line connectors in the engine compartment, detach the grommet, and push the vacuum lines into the passenger compartment.

Reverse the removal procedure.

To prevent engine damage after draining the engine block or the auxiliary heater cores.

Reverse the removal procedure and ensure to fill the engine cooling system afterward.

Disconnect the vacuum line connector.

Release the clamps and disconnect the auxiliary heater core hoses.