Grand Caravan V6-3.3L VIN R (2005)
inserted in a small well in the body of the expansion valve that is filled with a special silicone-based thermal grease. A small molded plastic push-in
retainer secures the sensor to a threaded hole in the top surface of the expansion valve. Two terminals within a molded plastic connector receptacle on
the sensor connect it to the vehicle electrical system through a take out and connector of the HVAC wire harness.
The evaporator temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
The evaporator temperature sensor monitors the temperature of the conditioned air once it passes through the A/C evaporator. The evaporator
temperature sensor will change its internal resistance in response to the air temperatures it monitors and is connected to the A/C-heater control through
sensor ground and signal circuits. As the conditioned air temperature increases, the resistance of the evaporator temperature sensor decreases and the
voltage monitored by the A/C-heater control decreases. The external location of the evaporator temperature sensor allows the sensor to be removed or
installed without disturbing the refrigerant in the A/C system.
The A/C-heater control uses this monitored voltage reading as an indication of the evaporator temperature. The A/C-heater control is programmed to
respond to this input by sending electronic messages to the powertrain control module (PCM) over the controller area network (CAN) data bus. The
PCM then cycles the A/C compressor clutch as necessary to optimize A/C system performance and to protect the A/C system from evaporator freezing.
The evaporator temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
The evaporator temperature sensor is diagnosed using the DRBIII(R) scan tool.
