Quote:
Originally Posted by DEPRIEST
...So I did the "Try to stop the fan" trick very very carefully with one of the used radiator hoses. It stopped easily. Now, the Visco Clutch (spelling?) I guess has fluid in it that expands outwards when the car is running hot(?) I didn't think there was a switch that would make it come on is there? The AUX fan is a different story. I'll look into that one soon...
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The aux fan is electrical and should kick on above 115 C to cool back down to 105 C. There are a couple of points at which it can fail but the most likley is the 105/115 temp sensor on top of the block (2 pin I believe) You can test it by bridging the two wires that run into it while the ignition is in the 'on' position... this should activate the fan... also temps above 115 C should activate the fan... You can also jump the fan to the battery to see if the fan's motor is shot.
The visco fan clutch is a tricky system. A broken fan shroud/a partly blocked radiator/ or a bad fan clutch can all cause that fan not to function. Usually the fan clutch and radiator being covered in oliy gunk is a good indicator of a fan clutch that has 'leaked out'.