Cooling System

Cooling System

The Hummer H1 cooling system consists of a radiator and a combined oil/transmission fluid cooler. The belt driven water pump circulates coolant through the engine that is then cooled by the radiator and engine fan.

Engine oil is cooled through the bottom half of the oil cooler while transmission fluid is cooled by the top half.

There is a separate, smaller cooler for the power steering fluid, mounted at the front of the cooling stack or on the fan shroud, depending on the model.