Suburban 1/2 Ton 2WD V8-5.3L VIN T (2004)
Low Pressure Sensor / Switch: Description and Operation
HVAC Systems - Manual
A/C LOW PRESSURE SWITCH
The 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 HVAC control module applies 12 volts to the A/C low pressure switch signal circuit. The switch will open when the A/C low side pressure reaches
124 kPa (18 psi). This prevents the A/C compressor from operating. The switch will then close when A/C low pressure side reaches 275 kPa (40 psi).
This enables the A/C compressor to turn back ON.
