I would like to thanks the member (whom I forgot the name) who gave, to my point of view the solution for adjusting the temperature of engagement of the fan clutch, ie to reduce the lenght of the pin by a few 1/10 of millimiters). I did it on my car, 260E, 1988, together with a straitning of the temperature spring plate and the result is absolutely perfect. In traffic jams the temperature does not go beyond 100° and stay around 82 degrees on the ride.

This forum is absolutely great

regards

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Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class 220CDI, 2009, W204

Sold E class 260E, W124, 1988 beloved car sold after 489 000 kilometres of reliable services (engine M103, clutch and 5 speed manual gear box all original).

E-class, W210 320CDI, 2000[/B], 225 000km, Sold