Explorer Sport Trac 4WD V6-245 4.0L SOHC VIN K SFI (2001)
Refrigerant Pressure Sensor / Switch: Description and Operation
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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A valve depressor, located inside the threaded end of the A/C cycling switch, presses in on the Schrader valve stem.
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This allows the suction pressure inside the suction accumulator to control the operation of the A/C cycling switch.
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The electrical switch contacts open when the suction pressure drops, The contacts close when the suction pressure rises. Refer to specifications
regarding operating pressure(s).
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When the A/C cycling switch contacts close, the signal to energize the A/C clutch is sent to the wide open throttle A/C cutoff relay.
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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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The A/C cycling switch will control the A/C evaporator core pressure at a point where the plate/fin surface temperature will be maintained slightly
above freezing.
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This prevents icing of the A/C evaporator core and blockage of air flow.
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It is not necessary to Perform the Refrigerant Discharging and Recovery Procedure to remove the A/C cycling switch.
