Cooling System

COOLING SYSTEM

DESCRIPTION
The cooling system components consist of a radiator, electric fan motors, shroud, pressure cap, thermostat, transmission oil cooler, water pump, hoses, clamps, coolant, and a coolant reserve system to complete the circuit.

COOLING SYSTEM COMPONENTS
The cooling system consists of:
- Charge Air Cooler
- Electric Cooling Fans
- A aluminum-core radiator with plastic side tanks
- A separate pressurized coolant tank
- A pressure/vent cap on the coolant tank
- Fan shroud
- Thermostat
- Coolant
- Low coolant warning lamp
- Coolant temperature gauge
- Water pump
- Hoses and hose clamps

OPERATION
The engine 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 water (coolant) for heater performance and cooling for automatic transmission oil. 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.
- When engine is cold: thermostat is closed, cooling system has no flow through the radiator. The coolant bypass flows through the engine only.
- When engine is warm: thermostat is open, cooling system has bypass flow and coolant flow through radiator.

Fig. 2 Cooling System Flow:

Coolant flow circuits for the 2.4L and 3.3/3.8L engines are shown in (Fig. 2).