A Cooling Fan Assembly pulls air through the radiator when we’re idling or moving slowly. We mount it right behind the radiator, and a motor spins the blades when coolant gets too hot. Some fans are electric, some run off the engine belt. It’s like a big desk fan for your engine. We check the motor and blades for cracks or loose bolts. If it stops, engine temperature climbs fast. We repair or swap it out so our machine stays chill.