Cooling System: Description and Operation

COOLING SYSTEM

The cooling system consists of an engine cooling module, pressure cap, coolant bottle, thermostat, coolant, and a water pump to circulate the coolant. The engine cooling module consist of a radiator, electric fan motors, shroud, internal transmission oil cooler, air conditioning condenser, receiver drier, and a auxiliary transmission oil cooler (if equipped).

- When Engine is cold: Thermostat is closed, cooling system has no flow through the radiator. The coolant flows through the engine heater core, coolant bottle and by-pass.

- When Engine is warm: Thermostat is open, coolant flows through the radiator, heater core, coolant bottle and by-pass.

The cooling systems primary purpose is to maintain engine temperature in a range that will provide satisfactory engine performance and emission levels under all expected driving conditions. It also provides hot coolant for heater, and cooling for automatic transmission fluid. It does this by transferring heat from engine metal to coolant, moving this heated coolant to the radiator, and then transferring this heat to the ambient air.