HVAC System Ford Crown Victoria II

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS

Heating and Ventilation

The heating and defrosting system has the following features

1. Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle.
2. Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level.
3. Controls the A/C blower motor speed.
4. Cooling or heating can be adjusted to maintain the desired temperature.
5. System uses a reheat method to provide conditioned air to the passenger compartment.
6. The blower motor draws outside air through the air inlet duct from just below the windshield during all system operations except for MAX A/C cooling (when recirculated air is used).
7. All airflow from the blower motor passes through the A/C evaporator core.
8. Regulates the temperature by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
9. The temperature blending is varied by the air temperature blend door, which regulates the amount of air that flows through and around the heater core, where it is then mixed and distributed.
10. Engine coolant flow through the heater core (1876) is prohibited by the heater control valve (18495) when the system is set to MAX A/C (manual climate control), or as determined by the climate control assembly in the AUTOMATIC mode (EATC/DATC).

Heater Core

The heater core consists of fins and tubes arranged to extract heat from the engine coolant and transfer it to air passing through the heater core.

Blower Motor

The A/C blower motor pulls air from the air inlet and forces it into the plenum assembly where it is mixed and distributed.

Heater Control Valve

The heater control valve is actuated by the air inlet door vacuum control motor circuit (manual climate control), or the heater control valve vacuum control circuit (EATC/DATC). When the heater control valve is closed (full vacuum), coolant flow through the heater core is cutoff and A/C cooling efficiency is increased.

Heating/Defrosting

Refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION .

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1. Disengage the wire harness connectors from the retainer.
2. Disconnect the blower motor electrical connector.
3. Remove the hose.
4. Remove the screws and remove the blower motor.
5. Remove the wheel from the blower motor. Remove the push clip. Remove the wheel from the blower motor.

Installation

1. To install, reverse the removal procedure.

Evaporator Core Housing

MATERIAL SPECIFICATION

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1. Recover the refrigerant. For additional information, refer to «REFRIGERANT SYSTEM RECOVERY»(/ford/crown-victoria/ii-1997-2011/remont/general-servicing-all-makes/#hvac-control-system-general-information__refrigerant-system-recovery) .
2. Raise the vehicle. For additional information, refer to «JACKING & LIFTING»(/ford/crown-victoria/ii-1997-2011/remont/hoistjack/#jacking-lifting) .
3. Remove the RH front wheel and tire.
4. Remove the screws from the RH fender apron and remove the fender apron.
5. Remove the nuts.
6. Lower the vehicle.
7. Disconnect the blower motor resistor electrical connector.
8. Disconnect the blower motor speed control electrical connector.
9. Disconnect the evaporator air discharge temperature sensor electrical connector.
10. Disconnect the evaporator outlet spring lock coupling. Discard the O-ring seals.
11. Disconnect the evaporator inlet spring lock coupling. Discard the O-ring seals.
12. Remove the nuts and position the purge valve and bracket away from the evaporator core housing.
13. Clamp off and disconnect the heater hoses at the heater core.
14. Disengage the connectors from the bracket.
15. Disconnect the blower motor electrical connector.
16. Remove the nut and reposition the wire harness away from the evaporator housing.
17. Disengage the wire harness from the bracket.
18. Remove the pin -type retainer and clip and remove the instrument panel lower insulator.
19. Fold back the carpet and remove the screw.
20. From inside the vehicle, remove the screw.
21. Remove the bolts.
22. Remove the in-car temperature sensor hose and elbow from the evaporator housing (if equipped).
23. Remove the evaporator core housing.
24. To install, reverse the removal procedure. Clean and lubricate the coolant hoses with coolant hose lubricant or plain water only if needed. Install new O-ring seals lubricated in clean PAG oil. Lubricate the refrigerant system with the correct amount of clean PAG oil. For additional information, refer to «REFRIGERANT OIL ADDING»(/ford/crown-victoria/ii-1997-2011/remont/general-servicing-all-makes/#hvac-control-system-general-information__refrigerant-oil-adding) .
25. Evacuate, leak test and charge the refrigerant system. For additional information, refer to «AIR CONDITIONING (A/C) SYSTEM RECOVERY, EVACUATION AND CHARGING»(/ford/crown-victoria/ii-1997-2011/remont/general-servicing-all-makes/#hvac-control-system-general-information) .

Removal and Installation

Note. If a heater core leak is suspected, the heater core must be leak tested before it is removed from the vehicle. For additional information, refer to HEATER CORE-- PRESSURE TEST .

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1. Remove the plenum chamber. For additional information, refer to «PLENUM CHAMBER»(/ford/crown-victoria/ii-1997-2011/remont/automatic-hvac-system/#hvac-system-air-distribution-system-filtering-system__plenum-chamber) .
2. Remove the screws and the heater core cover.
3. Carefully cut the seal above the heater core inlet and outlet tubes and remove the heater core.
4. To install, reverse the removal procedure.

See also:
• CLIMATE CONTROL SYSTEM-GENERAL INFORMATION
• REFRIGERANT SYSTEM RECOVERY
• JACKING & LIFTING
• REFRIGERANT OIL ADDING
• HEATER CORE-- PRESSURE TEST
• PLENUM CHAMBER