Air Conditioning: Specifications Ford Thunderbird XI

General Specifications

GENERAL SPECIFICATIONS

Torque Specifications

TORQUE SPECIFICATIONS

The A/C refrigerant system is a clutch cycling, thermostatic expansion valve type. The system components are

1. A/C compressor
2. A/C clutch
3. A/C condenser core
4. A/C evaporator core
5. thermostatic expansion valve
6. receiver drier
7. connecting refrigerant lines

The refrigeration system operation is controlled by the

1. thermostatic expansion valve.
2. evaporator discharge temperature sensor.
3. A/C compressor pressure relief valve.
4. A/C pressure transducer.
5. powertrain control module (PCM).
6. DATC module.
7. ambient temperature sensor.

The refrigerant system incorporates a variable capacity A/C compressor. The A/C compressor clutch engagement is controlled by the vehicle PCM.

The evaporator discharge temperature sensor senses evaporator discharge temperature. The DATC module monitors the evaporator discharge temperature sensor and communicates with the PCM to control clutch cycling. The DATC also monitors the ambient air temperature sensor and disables A/C operation when the ambient air temperature is below 0°C (32°F).

The A/C pressure transducer is located in the compressor discharge line and is monitored by the PCM. If high or low refrigerant pressures are experienced, the PCM will interrupt A/C compressor operation.

The pressure relief valve is installed in the compressor manifold and tube assembly and protects the system from excessively high refrigerant pressure.

The thermostatic expansion valve, which is mounted to the evaporator core inlet and outlet tubes, contains an adjustable orifice which provides the restriction that separates the high and low-pressure liquid phases in the refrigeration system.

Scheme 165

Scheme 166

Scheme 167

Note. Internal A/C compressor components are not serviced separately. The A/C scroll compressor is serviced only as an assembly. The A/C clutch, A/C clutch pulley and the A/C clutch field coil are serviceable.

The Ford Variable Scroll A/C compressor (SC90V) has the following characteristics

1. A variable capacity function controlled by a suction pressure sensing device.
2. A fixed and orbiting scroll to provide refrigerant compression.
3. A non-serviceable shaft seal.
4. The A/C compressor uses PAG Refrigerant Compressor Oil (R-134a Systems) F7AZ-19589-DA (Motorcraft YN-12-C) or equivalent meeting Ford specification WSH-M1C231-B. This oil contains special additives necessary for the A/C compressor.

The A/C compressor contains a thermal cutout switch which senses the compressor housing temperature. The switch will disengage the A/C compressor clutch if the housing temperature exceeds 120°C (247°F).

SC90V A/C compressors used on the six and eight cylinder engines are not interchangeable.

Scheme 168

The SC90V magnetic A/C clutch has the following characteristics

1. It drives the compressor shaft.
2. When battery positive voltage (B+) is applied to the A/C clutch field coil, the clutch disc and hub assembly is drawn toward the A/C clutch pulley.
3. The magnetic force locks the clutch disc and hub assembly and the A/C clutch pulley together as one unit, causing the compressor shaft to rotate.
4. When B+ is removed from the A/C clutch field coil, springs in the clutch disc and hub assembly move the clutch disc away from the A/C clutch pulley.