Temp gauge accuracy... not known. I jumped it the switch(with the connector still attached to the sensor) and the fans do indeed turn on, and stay on, till temp lowers to about 100.

Im taking it in this friday to have the system flushed and coolant replaced. I have not done this since i bought it (10000miles) and i dont know when the previous owner did.

Yes the fan clutch is working. It was replaced with the aux fan switch.

Compress, according to your IM, my high speed aux fan doesnt turn on till 135. I shall look for a different switch.

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VegStew
1983 300SD 70,000 WVO Powered miles
1990 300D In driveway with Head Off - Cracked