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Temp Switch Question
The first stage fan and turbo cooling pump had not been running recently when I
turned off the engine on my 1990 200TQ, so I replaced the thermal switch with
one that turns on at 85 C. The catalog lists this thermal switch as used for
the AC on a 200. The original switch is marked 110/97 C Max 130 C. Now the fan
and pump come on when I turn off the engine, but am I going to have a problem
with the fan running too much and running down the battery? It was 55 F this
morning (it's been cool here in MN) and the fan came on when the engine was shut
off. The thermostat is the original which I think is 87 C. Has anyone else
Thanks for any input or suggestions.
Fred L. DeRoos, Ph.D.
Senior Research Specialist
3M Corporate Research Laboratories