Description And Operation: Overview

The engine cooling system maintains the engine within an optimum temperature range under changing ambient and engine operating conditions. The system is a pressurized coolant expansion tank system with continuous bleeds to separate air from the engine coolant and prevent the formation of air locks. The engine cooling system also provides:

• Heating for: 
  • The passenger compartment

    For additional information, refer to: Heating and Ventilation - DESCRIPTION AND OPERATION and Fuel Fired Booster Heater - DESCRIPTION AND OPERATION .

  • The electric throttle.
• Cooling for: 
  • The oil cooler

    For additional information, refer to: Engine - DESCRIPTION AND OPERATION .

  • The engine

    For additional information, refer to: Engine - DESCRIPTION AND OPERATION .

  • The Automatic Transmission Fluid (ATF) cooler

    For additional information, refer to: Transmission Cooling (Vehicles With: 8HP45 8-Speed Automatic Transmission AWD/8HP45 8-Speed Automatic Transmission RWD, Description and Operation).

  • The charge air cooler

    For additional information, refer to: Intake Air Distribution and Filtering (Description and Operation).

  • The turbocharger.

For additional information, refer to: Fuel Charging and Controls - Turbocharger - DESCRIPTION AND OPERATION .

The primary components of the engine cooling system are the: 

• Variable coolant pump
• Electric thermostat
• Radiator
• Electric cooling fan
• Coolant expansion tank
• Engine oil cooler
• Cylinder block inlet tube
• Auxiliary coolant pump
• Separator
• Connecting hoses and pipes
• Charge air cooler
• Charge air coolant pump
• Charge air radiator
• Auxiliary radiator
• ATF cooler
• Thermostatic valve - ATF cooler
• ATF warming valveM

In cold climate markets, an active grille air shutter is installed to reduce aerodynamic drag and engine warm up time.

In hot climate markets, an additional auxiliary radiator is installed to improve the cooling capacity of the engine cooling system.