My 280C and 250C use electric fans only and have for years. This is here in Tucson where it has been known to get a bit "warmish" during the eight months of summer we experience. My 220D ran for eight years using only the original MB electric fan. The clutch fan took a "poo" and I eliminated it. Never had a problem.

Upgrade the battery, cables (especially the earthing strap) and alternator.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now