REAR. W/TRI ZONE AC. A sensor that reads passenger cabin air temperature. Reports the temperature of the air within the HVAC box / duct for automatic temperature control. Temperature Sensor for A/C Evaporator. CONDITIONING (A/C) Evaporator. control. Cabin. HVAC Duct. IN - CAR. Included with: Evaporator core, Floor duct, Side duct.