Fan control problems.

rhandwor · 06-17-2018, 06:35 PM

What sends the signal to the high speed radiator fan circuit. I think the ECU completes the ground for the high speed relay.
My other vehicles had two fans and the ac was turned on the other fan run. This vehicle has a two speed fan. Does the coolant temperature sensor tell the ECU when the temperature is high and completes the ground for the high speed relay.

rhandwor · 06-19-2018, 06:44 PM

Quote:

Originally Posted by rhandwor

What sends the signal to the high speed radiator fan circuit. I think the ECU completes the ground for the high speed relay.
My other vehicles had two fans and the ac was turned on the other fan run. This vehicle has a two speed fan. Does the coolant temperature sensor tell the ECU when the temperature is high and completes the ground for the high speed relay.

I hooked up my scanner and put it on data stream and monitored the operating temperature. A new Gates thermostat fixed the problem.
I used a logic probe and the high speed relay was getting proper signal, This vehicle will set a code when unplugged.

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