Navigator 4WD V8-5.4L (2010)
5. NOTE: Allow any residual coolant to drain from the auxiliary heater core after disconnecting the auxiliary heater hose fittings.
Position a suitable drain pan and disconnect the 2 auxiliary heater hose fittings from the heater core at the floorpan connection.
6. Disconnect the 2 auxiliary evaporator line fittings at the floorpan connection.
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Discard the O-ring seals.
7. Remove the 2 floorpan bracket bolts.
8. Remove the auxiliary headliner duct pin-type retainer and disconnect the duct.
9. Disconnect the auxiliary mode door actuator electrical connector.
10. Disconnect the auxiliary temperature blend door actuator electrical connector.
11. Disconnect the auxiliary blower motor resistor electrical connector.
12. Disconnect the auxiliary blower motor electrical connector and detach the wire harness from the housing.
13. Remove the 2 auxiliary heater core and evaporator core housing bolts.
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To install, tighten to 8 Nm (71 lb-in).
14. Remove the auxiliary heater core and evaporator core housing.
15. To install, reverse the removal procedure.
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Install new O-ring seals.
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Lubricate the refrigerant system with the correct amount of clean PAG oil.
16. Fill the engine cooling system. For additional information, refer to Cooling System &/or Engine Block Heater.
17. Evacuate, leak test and charge the refrigerant system.
