Crown Victoria V8-4.6L Flex Fuel (2008)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C Pressure Sensor
A/C Pressure Sensor
The PCM monitors the refrigerant system high-side pressure through the A/C pressure sensor.
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A valve depressor, located inside the threaded end of the A/C pressure sensor, presses a Schrader valve stem on the compressor discharge line
portion of the compressor-to-condenser discharge line.
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The A/C pressure sensor provides a voltage that is proportional to the A/C compressor discharge pressure, which allows for the A/C compressor
discharge pressure to be monitored by the PCM.
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The PCM uses this information for A/C clutch control, cooling fan control and idle speed.
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It is not necessary to recover the refrigerant to remove the A/C pressure sensor.
A/C Cycling Switch
The A/C cycling switch is mounted on a Schrader valve-type fitting on the top of the suction accumulator.
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The electrical switch contacts open when the suction pressure drops below normal levels. The contacts close when the suction pressure rises. For
specifications regarding operating pressure(s), refer to Heating and Air Conditioning.
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When the A/C cycling switch contacts open, the A/C clutch field coil is de-energized and compressor operation stops.
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A valve depressor, located inside the threaded end of the A/C cycling switch, presses in on the Schrader valve stem, allowing the suction pressure
inside the suction accumulator to control the operation of the A/C cycling switch.
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It is not necessary to discharge the refrigerant system to remove the A/C cycling switch.
