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GENERAL INFORMATION
COOLANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
COOLING SYSTEM COMPONENTS . . . . . . . . . . 2
COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . 1
ENGINE ACCESSORY DRIVE BELTS . . . . . . . . . . 2
ENGINE BLOCK HEATER . . . . . . . . . . . . . . . . . . 3
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .
2
SYSTEM COOLANT ROUTING . . . . . . . . . . .
. . .
2
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . .
. . .
2
DESCRIPTION AND OPERATION
BLOCK HEATER . . . . . . . . . . . . . . . . . . . . . . . . . 4
COOLANT PERFORMANCE . . . . . . . . . . . . . .
. . .
4
COOLANT RESERVE/OVERFLOW SYSTEM . . . . 4
COOLANT SELECTION AND ADDITIVES . . . . . . 5
COOLING SYSTEM HOSES . . . . . . . . . . . . . . . . . 6
RADIATOR PRESSURE CAP . . . . . . . . . . . . . . . . 5
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TRANSMISSION OIL COOLER . . . . . . . . . . . . . . 3
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . . 6
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DIAGNOSIS AND TESTING
ACCESSORY DRIVE BELT . . . . . . . . . . . . . . . . . . . 8
COOLING SYSTEM DIAGNOSIS . . . . . . . . . . . . 13
DEAERATION . . . . . . . . . . . .
. . . . . . . . . . . . 22
DRB SCAN TOOL . . . . . . . . . . . . . . . . . . . . . . . . 8
LOW COOLANT LEVEL AERATION . . . . . . . . . . 22
ON-BOARD DIAGNOSTICS (OBD) . . . . . . . . . . . 7
PRELIMINARY CHECKS . . . . . . . . . . . . . . . . . . 12
PRESSURE TESTING RADIATOR CAPS . . . . . . 22
RADIATOR CAP-TO-FILLER NECK SEAL-
PRESSURE RELIEF CHECK . . . . . . . . . . . . . . 21
RADIATOR COOLANT FLOW CHECK . . . . . . . . 19
TESTING COOLING SYSTEM FOR LEAKS . . . . 19
GENERAL INFORMATION
COOLING SYSTEM
CONTENTS
page
COOLING SYSTEM
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.
COOLING SYSTEM
7- 1
page
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . 20
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SERVICE PROCEDURES
ADDING ADDITIONAL COOLANT . . . . . . . . . . . 23
COOLANT SERVICE . . . . . . . . . . . . . . . . . . . . . 22
DRAINING COOLING SYSTEM . . . . . . . . . . . . . 23
REFILLING COOLING SYSTEM . . . . . . . . . . . . . 23
REVERSE FLUSHING . . . . . . . . . . . . . . . . . . . . 23
ROUTINE COOLANT LEVEL CHECK . . . . . . . . . 22
SERVICE COOLANT LEVEL . . . . . . . . . . . . . . . . 23
REMOVAL AND INSTALLATION
AUTOMATIC TRANSMISSION OIL COOLER . . . 24
AUXILIARY TRANSMISSION OIL COOLER . . . 24
COOLANT RESERVE/OVERFLOW BOTTLE . . . . 24
ENGINE BLOCK HEATER . . . . . . . . . . . . . . . . . 29
FAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
SERPENTINE DRIVE BELT . . . . . . . . . . . . . . . . 31
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . 27
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . 31
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . 25
CLEANING AND INSPECTION
COOLING SYSTEM HOSES . . . . . . . . . . . . . . . . 33
COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . 32
FAN BLADE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
RADIATOR PRESSURE CAP . . . . . . . . . . . . . . . 32
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SPECIFICATIONS
BELT TENSION . . . . . . . . . . . . . . . . . . . . . . . . . 34
COOLING SYSTEM CAPACITIES . . . . . . . . . . . . 33
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
SPECIAL TOOLS
COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
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 heavy duty cooling
package is available on most models . The package
consists of a radiator that has an increased number
of cooling fins .
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Troubleshooting
