Cooling Fan Switch

Cooling Fan Switch Operation:

The cooling fan switch on electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When engine is warm, the switch closes to turn fan on for cooling.

How To Instructions:

Inspect - Check for obvious problems.
Test - Give it an in-depth diagnosis.
Replace - Out with the old, in with the new.

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