Regarding the aux fan coming on: Isn't there a temperature switch, mounted in the coolant outlet neck of the engine, that can be switched to a different p/n, to come on at a lower temperature? I seem to recall something about that, when researching this for my 560SEL. I did not turn up anything on the search though. For some reason, I thought the standard temperature was 105C or so, and the new p/n would let it come on at 85C. The temperatures are from memory, so could be off. Maybe someone could post some information on this, or tell me I am all messed up?

For the record, my 1989 560SEL, (little more cubic cc's, same engine roughly, I think), hits 100C in traffic here in Sunny Florida, sometimes exceeds 105C or so. This is without the a/c on. When I notice, I kick the heat on, and it cools right down to about 85-90C, where it runs all the time. So far, no bad things have happened to mine. But I would prefer to have it run cooler.

__________________
1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)