A/C Cycling Switch

A/C CYCLING SWITCH

The A/C cycling switch is used to prevent icing of the evaporator core by cycling OFF the A/C compressor clutch when the suction pressure in the low-pressure side of the refrigerant system drops below acceptable levels. The PCM monitors the A/C cycling switch (and high-pressure cutoff switch on 5.4L and 6.8L vehicles or dual-function pressure switch on 6.4L diesel vehicles) through the A/C cycling switch (ACCS) circuit. When the ACCS circuit is open, the PCM will disengage the A/C compressor clutch.

The A/C cycling switch is located on a Schrader-type valve fitting on the suction accumulator. It is not necessary to recover the refrigerant to remove the A/C cycling switch.