Explorer 2WD V6-245 4.0L SOHC VIN E EFI (1997)
Refrigerant Pressure Sensor / Switch: Description and Operation
The A/C cycling switch is mounted on a Shrader-type fitting located on top of the suction accumulator/drier. A valve depressor, located inside the
threaded end of the A/C cycling switch, presses in on the Shrader valve stem. This allows the pressure inside the suction accumulator/drier to control the
A/C cycling switch.
When the contacts close, voltage is applied to the A/C clutch field coil to operate the A/C compressor. When the contacts open, the A/C clutch is
de-energized and the A/C compressor stops. The A/C cycling switch will control A/C evaporator core pressure to a point where the surface temperature
of the A/C evaporator core is maintained slightly above freezing. This prevents icing of the A/C evaporator core and air flow blockage.
