GM Service Manual Online
For 1990-2009 cars only

The cooling system maintains an efficient engine temperature level during all engine operating conditions.

The cooling system consists of the following components:

    • A radiator
    • A radiator surge tank
    • An electric engine cooling fan
    • A thermostat and housing
    • A coolant pump

The coolant pump draws coolant from the radiator and circulates the coolant through coolant jackets in the engine cylinder block and the cylinder heads. The coolant is then directed back to the radiator.

The system directs some coolant through hoses to the heater core in order to provide for defrost and passenger compartment heat. A surge tank connects to the cooling system. Pressurized coolant continuously flows through the surge tank.