A/C Pressure Sensor

A/C Pressure Sensor:

The Air Conditioning (A/C) pressure sensor is located in the A/C high side pressure refrigerant line in front of the air box. The pressure sensor is a transducer that varies resistance according to the difference between the outside air pressure and the pressure inside the high side refrigerant line. The sensor is used by the ECM to determine appropriate cooling fan speed (low, medium or high) during A/C operation. The sensor is also used by the ECM to turn Off the A/C relay if the refrigerant pressure is not within 180-2999 kPa (26-435 psi). The normal maximum range of the sensor can vary from 0.2 volts at 0 psi to 4.9 volts at 453 psi.