My US Ford Focus ZX3 2000 with 60k miles is overheating when idling.
The cooling fans (yes, there are two fans) are not coming on, but if I turn
on the A/C they work and the car doesn't overheat.
I checked the manual and seems like there are two fan circuits - with or
without A/C. I checked both fuses and relays and they are ok (F2, F3, R15
and R16 in the power distribution box in the engine compartment).
At that point I'm baffled - the fans themselves are ok as they work with the
a/c on; the fuses and the relays are ok; the thermal sensor is ok as the
gauge shows ok and this is the only sensor from the radiator.
My search found that several people reported similar problems, but
unfortunately there was no follow up on what was wrong.
What can possibly be wrong ? Any suggestions before I go to the dealership ?