Mystique V6-153 2.5L DOHC VIN L SFI (1999)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C Cycling Switch
LOCATION
On top of the suction accumulator.
FUNCTION
The A/C cycling switch has the following functions:
^
Protecting the evaporator against icing.
^
Protecting the air conditioning system against reduced pressure or an empty system.
A/C Cycling Switch
OPERATION
The A/C cycling switch has the function of a de-icing switch and switches the compressor clutch on/off.
The pressure and the temperature inside the suction accumulator and the evaporator are the same. If the pressure and, therefore, the temperature,
drops in the suction accumulator, the temperature in the evaporator approaches freezing point. The evaporator threatens to ice up and lose its
ability to cool. The A/C cycling switch then opens the compressor clutch when the pressure drops to a certain level and only closes it again when
there is an appropriate rise in pressure.
