Low Pressure Switch

A/C Low Pressure Switch:

DESCRIPTION
The low refrigerant pressure switch is located on the Evaporator / Accumulator (jumper) line. The switch when pressurized is closed and allows the compressor clutch relay to energize, feeding battery voltage to the compressor clutch coil. If the pressure drops below 69 kPa ±7 kPa (10 psi ±1 psi), the switch opens and cuts off voltage to the clutch. There is a circuit to the PCM which monitors the state of the switch for diagnostic purposes.