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

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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"