Re: strange overheating problem
> 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 ?
My 2001 ZX3 does the same thing (last night in traffic, actually). The
fans won't kick in until the temperature gauge is nearly to or touching
the red zone way at the high end of the scale. Next time let it go and
see if that's what happens. If they don't work then, the worst that
will happen is you will boil coolant out.