Locate Coolant Temperature Sensor/Switch on Celica 20L DOHC (3S-GE)
Coolant Temperature Sensor / Switch HVAC: Testing and Inspection
Automatic A/C only
NOTE: The water temperature switch is under the heater radiator.
Inspect the switch continuity between each terminal at each water temperature.
NOTE: When checking on the vehicle, the coolant temperature will be 20°C (68°F) higher than that of the contact point on the switch.