Check Fuse - its easy todo
If in dowt - replace it anyway - its cheap enough
Next Test the Fan - Stick the Posi of the fan onto battery
Negi on negi of battery - does it work?
if yes - there is a problem else where
If no- theres your problem
If Yes - Check the Relay, get a low 12v supply onto 2 pins to activate switch
Then use a Multi-meter set to continuity to see if the switch is activated or not
If the Gate opens and closes - ie relay works - problem is else where
Next i'd be checking the Temperature sensor, there cheapish - but it means dumping coolant again
If a new sensor doesn't cure the problem, start the Run around where the wires go, start checking for breaks or signs of shorting or melting
if that seems to be good - i'd guess you'll be looking at the ECU
However if the Fan isn't working, then you can get a little Black box device, that reads temperature of the Rad, and when it reach's that temperature, it'll activate fan for you
Its better then having a Switch inside the car, AND it looks better to any possible buyers in the future
Ziggy
