A/C Cycling Switch
WARNING: This page is about a different car, the 1998 Mercury Tracer. However, it is still accessible from the selected car via links, so may be relevant.
Located on top of suction accumulator-drier, A/C cycling switch monitors refrigerant pressure and sends corresponding information to the Powertrain Control Module (PCM). The PCM allows compressor operation when refrigerant pressure increases to 46 psi (3.4 kg/cm2 ) and stops compressor operation when refrigerant pressure decreases to 23 psi (1.6 kg/cm2 ). When functioning properly, A/C cycling switch prevents evaporator icing and blockage of airflow through evaporator fins.