Low Pressure Sensor / Switch: Description and Operation
A/C LOW PRESSURE SWITCHThe A/C low pressure switch protects the A/C system from a low pressure condition that could damage the A/C compressor or cause evaporator icing. The powertrain control module (PCM) applies the A/C low pressure switch control signal. The switch will open when the A/C low side pressure reaches 165-179 kPa (24-26 psi). This prevents the A/C compressor from operating. The switch will then close when A/C low pressure side reaches 2282 kPa (331 psi). This allows the A/C compressor to turn back ON.