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Few hints for the coding:
Make sure you program in hysteresis so it does not try to open and close rapidly.
Most sensors for the ECU are 0-5V - use a multimeter on the coolant sensor wire.
You could use a relay from the fan circuit to switch the arduino input pin to the arduino 5V rail.
For ambient temperature use a Dallas 1 wire sensor.
Feel free to shoot me a message if you need a hand with the code. I have been doing this for far too many years.
Simon
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