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Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Thermo Switch

1.

Drain coolant and remove thermo switch.

2.

Cool thermo switch to below 109°F and check that switch has continuity.

3.

Heat switch to above 131°F and check that there is no continuity.

4.

Apply liquid sealer to threads of switch and reinstall it, then refill radiator with coolant.

Sensors and Switches > Sensors and Switches - Cooling System > Engine - Coolant Temperature Sensor/Switch > Coolant Temperature Sensor/Switch (For Computer) > Component Information > Testing and Inspection > Coolant Thermosensor > Page 55

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