Coolant Temperature Sensor Testing and Inspection
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Coolant Temperature Switch
1.
Turn ignition Off and disconnect wire from temperature switch.
2.
Using an ohmmeter, connect one probe to a ground or to temperature switch ground terminal. Connect other probe to center terminal of switch.
3.
On a cold engine, there should be continuity with a resistance reading less than 100 ohms. If not, replace switch. The charge temperature switch
must be cooler than 60°F for this reading to be obtained.
4.
On a hot engine (at normal operating temperature), there should be no continuity. If there is continuity, replace temperature switch or charge
temperature switch.
