Hi yall,
I would like to know how I can tell if the switch/sensor or aux fan itself has gone bad. Any relpies will help.
Thanx,

P.S. Fan never goes on, used to though until I took a long trip.

85' 325e

I would check couple of things
-Check your fan circuit-unplug connector & jump two pins (with ignition on) if fan works, circuit ok
-Check if area around the switch is hot (@normal operation temp.) if cold or just worm –you may have stuck thermostat.
-Switch –cold engine switch is norm open, hot engine-norm closed.

Thanx.....