RepairPal Certified shops can diagnose and repair your 1993 Mercedes-Benz 300SL. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
electric fan or clutch fan? if electric fan is the fan coming on when engine is fully warmed up ? clutch fan this site might help
http://www.aa1car.com/library/cooling_fan_clutch.htm