Venture AWD V6-3.4L VIN E (2004)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C REFRIGERANT PRESSURE SENSOR
The A/C refrigerant pressure sensor is a 3-wire piezoelectric pressure transducer. A 5-volt reference, low reference, and signal circuits enable the sensor
to operate. The A/C pressure signal can be between 0-5 volts. When the A/C refrigerant pressure is low, the signal value is near 0 volts. When the A/C
refrigerant pressure is high, the signal value is near 5 volts.
The A/C refrigerant pressure sensor protects the A/C system from operating when an excessively high or low pressure condition exists. The PCM
disables the compressor clutch under the following conditions:
-
A/C pressure is more than 2979 kPa (432 psi). The clutch will be enabled after the pressure decreases to less than 1620 kPa (235 psi).
-
A/C pressure is less than 179 kPa (26 psi). The clutch will be enabled after the pressure increases to more than 207 kPa (30 psi).
The purpose of the heating and A/C system is to provide heated and cooled air to the interior of the vehicle. The A/C system will also remove humidity
from the interior and reduce windshield fogging. The vehicle operator can determine the passenger compartment temperature by adjusting the air
temperature switch. Regardless of the temperature setting, the following can effect the rate that the HVAC system can achieve the desired temperature:
-
Recirculation actuator setting
-
Difference between inside and desired temperature
-
Difference between ambient and desired temperature
-
Blower motor speed setting
-
Mode setting
-
Auxiliary HVAC settings
