if by magnetic clutch fan, you mean the one thats not on all the time and not driven by the engine, then yes it is. but ive never really checked, i keep my windows open so i hear the aux fan come on.

where could i get one of those fan switches, and is it an easy DIY

__________________
Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"

So you are stating that your clutch fan DOES operate when the coolant temperature rises?

You should be able to get the above mentioned aux. temp. switch locally. If not, then click on Buy Parts at the top of this page and order it from them. Yes, it is an easy DIY replacement. If I were you, I would go ahead and replace both temperature switches...you DON'T want any overheating situations.

__________________

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible