Ok my fan never start but I test it and she works great.... all the wires have been tested and they are good so I changed the sensor who tell to the fan to start ( sorry I just dont remember the name of the sensor...)

So last time I filled my car I put distillated water with REDLINE .... and if I remember I heard that this sensor have to detect a correct pH in the coolant to see if it is the right fluid....

Is it true if yes the problem is the coolant fluid .... I will put 50/50 water and prestone like usualy...

Thank