Had this fun on my old 124 too. I know the regulator needs to be replaced on the w210. The burnt silicon smell has to come from the regulator. I just don't want to destroy the new one if the fan is pulling to much of a load

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory