Discharge Air Temperature Sensor / Switch: Description and Operation
AIR OUTLET TEMPERATURE SENSORAir Outlet Temperature Sensor:
The air outlet temperature sensor is a two-wire temperature sensing element that detects the temperature of the air coming out of the heater housing unit. The sensor is attached to heater housing unit directly behind the ATC heater-A/C control panel. The thermistor will change resistance as the temperature changes.
The air outlet temperature sensor monitors the temperature of the air coming out of the heater housing unit. The sensor will change its internal resistance in response to the temperatures it monitors. The ATC control module is connected to the sensor through a sensor ground circuit and a sensor signal circuit. As the air temperature increases, the resistance of the sensor decreases and the voltage monitored by the module decreases. The operating range of the air outlet temperature sensor is 0° C (32° F) and 95° C (203° F). The module uses this monitored voltage reading to an indication of the outlet air temperature. The ATC control module makes adjustments to maintain the requested interior temperature by cycling both the A/C compressor and solenoid heater valve on and off.
The air outlet temperature sensor is diagnosed by performing the ATC Function Test using the DRBIII(R) scan tool. Refer to Body Diagnostic Procedures.
The air outlet temperature sensor cannot be adjusted or repaired, and if faulty or damaged, it must be replaced.