Q45 V8-4.5L (VK45DE) (2002)
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Refrigerant Pressure Sensor / Switch: Description and Operation
Refrigerant Flow
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the liquid tank.
If the system pressure rises above, or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and
sends the voltage signal to the ECM. ECM makes the A/C relay go OFF and stops the compressor when pressure on the high pressure side detected by
refrigerant pressure sensor is over about 2,746 kPa (28 kg/sq.cm, 398 psi), or below about 134 kPa (1.4 kg/sq.cm, 20 psi).
The refrigerant pressure sensor is installed at the liquid tank of the air conditioner system. The sensor uses an electrostatic volume pressure transducer to
