A/C Cycling Switch

WARNING: This page is about a different car, the 2002 Lincoln Blackwood. However, it is still accessible from the selected car via links, so may be relevant.

The A/C cycling switch is mounted on a Schrader valve-type fitting on top of suction accumulator. A valve depressor, located inside threaded end of A/C cycling switch, presses in on Schrader valve stem. This allows suction pressure inside suction accumulator to control operation of A/C cycling switch. Electrical switch contacts open when suction pressure drops, contacts close when suction pressure rises. See SPECIFICATIONS .

When A/C cycling switch contacts close, A/C clutch field coil is energized. When A/C cycling switch contacts open, A/C clutch field coil is de-energized and compressor operation stops. A/C cycling switch will control evaporator core pressure at a point where plate/fin surface temperature will be maintained slightly above freezing. This prevents icing of evaporator core and blockage of airflow. It is not necessary to discharge refrigerant system to remove A/C cycling switch.