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DESCRIPTION AND OPERATION
COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . 1
AUTOMATIC TRANSMISSION OIL COOLER. . . . . 2
COOLANT RESERVE/OVERFLOW SYSTEM . . . . . 2
COOLING SYSTEM FANS . . . . . . . . . . . . . . . . . . . 3
BLOCK HEATER . . . . . . . . . . . . . . . . . . . . . . . . . . 4
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
RADIATOR PRESSURE CAP . . . . . . . . . . . . . . . . . 5
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
HOSE CLAMPS . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . . . 7
ELECTRIC COOLING FAN . . . . . . . . . . . . . . . . . . . 8
DIAGNOSIS AND TESTING
ON-BOARD DIAGNOSTICS (OBD) . . . . . . . . . . . . 9
DRB SCAN TOOL . . . . . . . . . . . . . . . . . . . . . . . . . 9
ACCESSORY DRIVE BELT DIAGNOSIS. . . . . . . . . 9
PRELIMINARY CHECKS . . . . . . . . . . . . . . . . . . . 11
RADIATOR COOLANT FLOW CHECK . . . . . . . . . 17
COOLING SYSTEM—TESTING FOR LEAKS . . . . 17
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . . 19
ELECTRIC COOLING FAN . . . . . . . . . . . . . . . . . . 19
RADIATOR CAP-TO-FILLER NECK
SEAL—PRESSURE RELIEF CHECK . . . . . . . . . 20
RADIATOR CAP—PRESSURE TESTING. . . . . . . 20
COOLANT—LOW LEVEL AERATION . . . . . . . . . 21
DEAERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SERVICE PROCEDURES
COOLANT—ROUTINE LEVEL CHECK. . . . . . . . . 21
COOLANT—ADDING ADDITIONAL. . . . . . . . . . . 21
DESCRIPTION AND OPERATION
COOLING SYSTEM
DESCRIPTION
The cooling system regulates engine operating tem-
perature. It allows the engine to reach normal oper-
ating temperature as quickly as possible, maintains
normal operating temperature and prevents over-
heating.
The cooling system also provides a means of heat-
ing the passenger compartment and cooling the auto-
COOLING SYSTEM
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COOLANT—LEVEL CHECK . . . . . . . . . . . . . . . . . 21
COOLING SYSTEM—DRAINING AND
FILLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
COOLING SYSTEM—REVERSE FLUSHING . . . . 22
REMOVAL AND INSTALLATION
TRANSMISSION OIL COOLERS . . . . . . . . . . . . . 23
COOLANT RESERVE TANK . . . . . . . . . . . . . . . . . 23
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
RADIATOR—2.5L . . . . . . . . . . . . . . . . . . . . . . . . 29
RADIATOR—4.0L . . . . . . . . . . . . . . . . . . . . . . . . 31
ELECTRIC COOLING FAN—2.5L . . . . . . . . . . . . 33
ELECTRIC COOLING FAN—4.0L . . . . . . . . . . . . 34
BLOCK HEATER . . . . . . . . . . . . . . . . . . . . . . . . . 35
ENGINE ACCESSORY DRIVE BELTS. . . . . . . . . . 35
COOLING SYSTEM FANS . . . . . . . . . . . . . . . . . . 38
VISCOUS FAN DRIVE REMOVAL/
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . 39
CLEANING AND INSPECTION
RADIATOR PRESSURE CAP . . . . . . . . . . . . . . . . 39
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . 39
FAN BLADE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
COOLING SYSTEM HOSES. . . . . . . . . . . . . . . . . 40
SPECIFICATIONS
BELT TENSION . . . . . . . . . . . . . . . . . . . . . . . . . . 40
TORQUE SPECIFICATIONS . . . . . . . . . . . . . . . . . 40
SPECIAL TOOLS
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
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 heavy duty cooling
package is available on most models. The package
consists of a radiator that has an increased number
of cooling fins. Vehicles equipped with a 2.5L/4.0L
engine and heavy duty cooling and/or air condition-
ing also have an auxiliary electric cooling fan.
The cooling system consists of:
• A radiator
• Cooling fan (mechanical and/or electrical)
• Thermal viscous fan drive
COOLING SYSTEM
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