DESCRIPTION AND OPERATION
COOLING SYSTEM
DESCRIPTION
The cooling system consists of:
• Radiator
• Cooling fan (mechanical/Electrical)
• Thermal viscous fan drive
• Fan shroud
• Radiator pressure cap
• Thermostat
• Coolant reserve/overflow system (integral to
upper fan shroud)
• Transmission oil cooler (if equipped with an
automatic transmission)
• Coolant
• Water pump
• Hoses and hose clamps
OPERATION
The cooling system regulates engine operating tem-
perature. It allows the engine to reach normal oper-
ating temperature as quickly as possible. It also
maintains normal operating temperature and pre-
vents overheating.
The cooling system also provides a means of heat-
ing the passenger compartment and cooling the auto-
matic transmission fluid (if equipped). The cooling
system is pressurized and uses a centrifugal water
pump to circulate coolant throughout the system.
An optional factory installed maximum duty cool-
ing package is available on most models. This pack-
age will provide additional cooling capacity for
vehicles used under extreme conditions such as
trailer towing in high ambient temperatures.
COOLANT RESERVE/OVERFLOW SYSTEM
DESCRIPTION
The coolant reserve/overflow tank is integral to the
upper fan shroud assembly and is made of high tem-
perature plastic.
Fig. 1 Engine Cooling System Flow—5.2L/5.9L Engines—Typical
1 – HEATER
2 – BYPASS*
3 – CROSSFLOW RADIATOR
7 - 2 COOLING SYSTEM DN
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