I need to find my coolant temp sensor on my '86 300E, the one that triggers the aux. fan (I want to bridge it with a resistor to make it come on at a lower temp) - would someone please tell me where it is and what it looks like? What color are the wires going to it or what color is the plastic part of it?

Also, is there any accurate way to test it without special tools? It seems to be triggering the fan a bit late - about 110C by the dash gauge.

Thanks,

Gary