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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Description and Operation >> Cooling System Description and Operation >> Cooling System >> Notes

Cooling System: Notes

The cooling systems function is to maintain an efficient engine operating temperature during all engine speeds and operating conditions. The cooling system is designed to remove approximately one-third of the heat produced by the burning of the air-fuel mixture. When the engine is cold, the coolant does not flow to the radiator until the thermostat opens. This allows the engine to warm quickly.