Cooling Cycle (LNF)

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Coolant from the water pump is circulated through the water jackets in the cylinder block and absorbs the released heat.

The coolant then flows through the cylinder head gasket openings and into the cylinder head. The coolant flows through the water jackets surrounding the combustion chambers and valve seats where the coolant absorbs additional heat.

Coolant flows from the water pump outlet to the radiator inlet port located on top of the radiator. From the radiator outlet, the coolant flows to both the engine oil cooler (EOC) and the thermostat housing.

At the EOC, coolant flows through the EOC and is then directed to the thermostat housing and the surge tank.
At the thermostat housing the flow of coolant will either be stopped by the thermostat until the engine reaches normal operating temperature, or it will flow through the thermostat and back through the cooling system to the radiator where it will be cooled.

Some coolant flow through the engine is directed through the heater core, then back to the engine. This provides the passenger compartment with heat and defrosting capability as the cooling system warms up.

Coolant flow is also directed to the turbocharger assembly to aid the turbocharger in temperature control and system performance. At this point, the coolant flow cycle is complete.

Efficient operation of the cooling system requires proper functioning of all cooling system components.