Heater Core Case: Service and Repair

HEATER CORE AND EVAPORATOR CORE HOUSING, ASSEMBLY AND COMPONENTS

REMOVAL

CAUTION:
- This engine is equipped with a cold side thermostat. Whenever the engine block or the front or rear (auxiliary) heater cores have been drained, fill and bleed procedures must be carried out or damage to the engine can occur.
- Refrigerant Compressor Oil (mineral oil) F73Z-19577-AA (Motorcraft YN-9-A) should be used to lubricate R-134a refrigerant system O-ring seals only and should not be added to the R-134a refrigerant system as an A/C compressor lubricant. PAG Refrigerant Compressor Oil F7AZ-19D589-DA (Motorcraft YN-12-C) or equivalent meeting Ford specification WSH-M1C231-B only should be used as an A/C compressor lubricant.

NOTE:
- If an evaporator core leak is suspected, the evaporator core must be vacuum leak tested before it is removed from the vehicle.
- Installation of a new receiver/drier is not required when repairing the air conditioning system except when there is physical evidence of contamination from a failed A/C compressor or damage to the receiver/drier.
- New O-ring seals, lubricated in clean mineral oil, must be installed before reconnecting any A/C fitting which has been disconnected.
- Lubricate the coolant hoses with plain water only if needed.

1. Recover the refrigerant.
2. Remove the instrument panel. Refer to: Body and Frame, Interior Trim, Dashboard/Instrument Panel, Service and Repair, Removal and Installation, Removal and Installation
3. Clamp off the heater core inlet and outlet hoses at the heater core connection.







4. Remove the parts in the order indicated in the illustration and table.

Item 3: Vacuum Connector Removal Note







1. Disconnect the vacuum line connectors in the engine compartment.







2. Detach the grommet and push the vacuum lines into the passenger compartment.

INSTALLATION
1. To install, reverse the removal procedure.
2. Lubricate the refrigerant system with the correct amount of clean PAG oil.
3. Fill and bleed the engine cooling system.
4. Evacuate, leak-test and charge the refrigerant system.