COOLING
DESCRIPTION
The cooling system regulates engine operating temperature. It allows the engine to reach normal operating temperature as quickly as possible, maintains normal operating temperature and prevents overheating.
The cooling system also provides a means of heating the passenger compartment and cooling the automatic transmission fluid. The cooling system is pressurized and uses a centrifugal water pump to circulate coolant throughout the system.
COOLING SYSTEM COMPONENTS
The cooling system consists of:
- Charge Air Cooler (Diesel engine)
- 2 Speed Electric Cooling Fan
- Mechanical fan drive (Diesel engine)
- Aluminum-core radiator with plastic side tanks and pressure cap (Gas engine)
- Aluminum-core radiator with plastic side tanks (Diesel engine)
- Pressurized coolant recovery container (Diesel engine)
- Ambient coolant recovery container (Gas engine)
- Water pump
- Combination A/C condenser/transmission oil cooler (automatic transmission)
- Thermostat
- Coolant
- Hoses and hose clamps
OPERATION
- When engine is cold the thermostat is closed. The cooling system has no flow through the radiator. The coolant flows through the engine, water pump, and heater.
- When engine is warm, the thermostat is full open. The coolant flows through the engine, radiator, heater, and water pump.
- On the diesel engine coolant flows through the engine, radiator, heater, and water pump.
- As coolant expands, some coolant will move to the coolant recovery container. Once the coolant cools, the coolant from the coolant recovery container will move back to the radiator. (Gas engine only)