Engine - Coolant Temperature Sensor/Switch: Testing and Inspection

Water Thermosensor Testing:

1. Disconnect water thermosensor connector. Remove sensor from engine.
2. Place sensor in a container with water and a thermometer. Heat gradually.
3. Check sensor resistance with an ohmmeter:

COOLANT TEMP. RESISTANCE (K OHMS)

-20°C (-4°F) 14.5 - 17.8
20°C (68°F) 2.2 - 2.7
40°C (104°F) 1.0 - 1.3
60°C (140°F) 0.50 - 0.65
80°C (176°F) 0.29 - 0.35


4. If not as specified, replace sensor.
5. Install sensor with a new washer and torque to 18 - 22 ft lb (25 - 29 Nm).
6. Connect thermosensor connector.