Cooling Cycle

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Coolant also flows from the water pump outlet and into the engine block. In the engine block, the coolant circulates through the water jackets surrounding the cylinders where the coolant absorbs heat.

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

Coolant is also directed to the throttle body. There the coolant circulates through passages in the casting. During initial start up, the coolant assists in warming the throttle body.

From the cylinder heads, the coolant is then forced to the engine outlet. Coolant leaves the engine through four different routes:

Through the engine outlet fitting to the radiator. This path is blocked at cold conditions by the thermostat at the engine inlet fitting.
Through the radiator bypass.
To the heater core for passenger compartment heat and defrost.
Through the vent hose to the surge tank, providing continuous direction of the cooling system.

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