Help- 87 190d overheating problem...

[satyr]

Hey everybody,
Drove the 190d (87 euro 2.0L 4spd) in heavy traffic and watched the needle rise to about the 110-115 degree area of my temp guage this weekend. The auxillary cooling fan (I have just one on the driver's side) never came on. I also never heard any fan noise from under the hood either. I eventually avoided overheating by running the heater...

I am nearly certain I have the "Magnetic Fan Clutch" on my model- the fan can be spun freely in either direction by hand when the car is running at idle and normal running temp.

Is there any way to TEST this fan clutch?

Also- is there some sort of temp sensor that may have caused these fans NOT to come on? If so- where is it, and is there a way to test it?

Please post or email- thanks in advance- John