REAR. Temp sensor. A sensor that reads passenger cabin air temperature. For Auxiliary HVAC. HVAC Evaporator Temperature Switch. Location-Dash Outlet. Location-Floor Duct. Location-Outlet Duct. Reports the temperature of the air within the HVAC box / duct for automatic temperature control. Cabin. HVAC Duct. HVAC Evaporator Switch. IN - CAR. REFRIGERANT. THERMOSTATIC SWITCH. Upper CONTROL arm lock nut.