That's why my idea was to jump the hot lead on the coolant sensor connector directly to a good chassis ground. Maybe that ground lead has gone bad somewhere. You're right, if that connector does have a path to ground then it should activate the relay and fire the fan right up. So maybe it doesn't?The connector to the coolant sensor SHOULD energize the cooling fan when a jumper is inserted between the two contacts - but it does not. One wire IS energized even with key off, the other is ground.
The cooling fan controller is supposed to energize the fan whenever the A/C is “on”, and at anytime coolant temperature exceeds spec’d limits - regardless if key is on or off. It does not.
This one has me tearing my hair out, what’s left of it.
My Ford Shop Manual says that the cooling fan controller is located behind the glove box insert - convenient, huh?
It’s not there … so tomorrow is going to be a royal PITA.
The fan controller not turning it on with the AC is interesting. The fan does come on when you jump the fan relay terminals directly, right?