The clutch fan should lock-up at 94C & the aux fan should come on at 107C(hi-speed) on most cars after 1988. The a/c pressure switch should turn the low speed fan speed at 16 to 20 BAR of pressure.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator