Evaporator Temperature Sensor: Description

WARNING: This page is about a different car, the 2005 Dodge Grand Caravan, 2005 Dodge Caravan, and 2005 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.

The evaporator temperature sensor used for the manual and automatic temperature control systems on RS models is installed on the top of the HVAC housing behind the instrument panel and measures the air temperature downstream of the evaporator. See Fig 1. The sensor is an electrical thermistor in a plastic housing that is inserted into the HVAC housing. Two terminals within the 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.

Fig 1: Evaporator Temperature Sensor - Typical

Courtesy of DAIMLERCHRYSLER CORP.

1 - EVAPORATOR TEMPERATURE SENSOR

2 - HVAC HOUSING

3 - A/C EVAPORATOR

The evaporator temperature sensor used for the manual and automatic temperature control systems on RG models is installed on the top of the expansion valve in the right rear corner of the engine compartment and measures the temperature of the evaporator coils. See Fig 2. The sensor has a small probe that is 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.

Fig 2: Evaporator Temperature Sensor - RG Models

Courtesy of DAIMLERCHRYSLER CORP.

1 - EVAPORATOR TEMPERATURE SENSOR

2 - A/C EXPANSION VALVE

The evaporator temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.