John wrote:
>
.......
> If the aux fan is not coming on while driving-the coolant temp is OK,
> providing that the aux fan switch and motor function.
>

This is not necessarily the case. The fan temp switch is in the exit
path of the radiator.  If the coolant coming out of the radiator is too
hot the radiator fan turns on to cool it more. The coolant sender for
the gauge is in the engine compartment and is a far more meaningful
indication of engine temperature. The engine can severely overheat and
the radiator can still be cold to the touch, far from turning on the
fan. A water pump pulley loose on its shaft, a stuck closed thermostat,
or a broken water pump belt can all do this. Never disregard the warning
of excess temp provided by the gauge.

Mark

Mark