Hi:
Here is how they work. The temp sending unit sends a signal to the fan relay when a certain temp is met. Then, the relay sends power to the fan. When the engine temp is toward the hot area, disconnect the fans to see if there is power to them. If there is, the fan motor must be bad. If there is no power, you need to work your way backwards to see where you find power again. Let me know what you find.
Joe
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Tuesday, April 6th, 2021 AT 7:53 PM