Evaporator Temperature Sensor
The evaporator temperature sensor is a Negative Temperature Coefficient (NTC) thermistor. The sensor is mounted on the LH side of the heater casing, and measures the temperature of cooled air once it has traveled over the evaporator. The sensor receives a 5 V reference feed from the ATC module. By monitoring the returned voltage, the ATC module can calculate the resistance of the sensor and hence evaporator temperature.