All Models

Warm engine to normal operating temperature and stop engine. Using a thermometer, measure temperature of coolant (oil on Volkswagen models). Disconnect electrical connector from temperature sensor and connect 1 lead of ohmmeter to terminal in sensor and other lead to ground. Ohmmeter readings should be as specified in table. If not, replace temperature sensor.
On Volkswagen models, if resistance reading is too high, touch ground lead of ohmmeter to sensor body. If resistance is as specified in table, corrosion is present between sensor and cylinder head. If resistance is still not as specified, replace temperature sensor.

Temperature/Resistance Relationship