Jeep 1997 Grand Cherokee Service Manual page 229

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GENERAL INFORMATION
COOLANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
COOLING SYSTEM COMPONENTS . . . . . . . . . . 2
COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . 1
ENGINE ACCESSORY DRIVE BELTS . . . . . . . . . 1
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SYSTEM COOLANT ROUTING
WATER PUMP BYPASS HOSE-5.2/5.9L V-8
ENGINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DESCRIPTION AND OPERATION
ACCESSORY DRIVE BELT TENSION . . . . . . . . . 4
AUTOMATIC TRANSMISSION OIL COOLERS
COOLANT PERFORMANCE . . . . . . . . . . . . . . . . 5
COOLANT RESERVE/OVERFLOW SYSTEM . . . 3
COOLANT SELECTION-ADDITIVES . . . . . . . . . . 5
COOLING SYSTEM HOSES . . . . . . . . . . . . . . . . 6
ENGINE BLOCK HEATER
RADIATOR PRESSURE CAP . . . . . . . . . . . . . . . 5
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . 4
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . 7
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DIAGNOSIS AND TESTING
COOLING SYSTEM DIAGNOSIS
DEAERATION . . . . . . . . . . . . . . . . . . . . . . . . . 21
DRB SCAN TOOL . . . . . . . . . . . . . . . . . . . . . . . 9
LOW COOLANT LEVEL-AERATION . . . . . . . . . 21
ON-BOARD DIAGNOSTICS (OBD) . . . . . . . . . . . 8
PRELIMINARY CHECKS
PRESSURE TESTING RADIATOR CAP
RADIATOR CAP-TO-FILLER NECK SEAL-
PRESSURE RELIEF CHECK . . . . . . . . . . . . . 20
RADIATOR COOLANT FLOW CHECK
SERPENTINE DRIVE BELT DIAGNOSIS . . . . . . 10
TESTING COOLING SYSTEM FOR LEAKS
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . 10
VISCOUS FAN DRIVE
GENERAL INFORMATION
ENGINE ACCESSORY DRIVE BELTS
CAUTION: When installing a serpentine accessory
drive belt, the belt MUST be routed correctly. If not,
the engine may overheat due to water pump rotat-
ing in wrong direction. Refer to the appropriate
engine Belt Schematic in this Group for the correct
belt routing. Or, refer to the Belt Routing Label
located in the engine compartment.
COOLING SYSTEM
CONTENTS
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page
WATER PUMP TESTS . . . . . . . . . . . . . . . . . . . . 9
SERVICE PROCEDURES
ADDING ADDITIONAL COOLANT . . . . . . . . . . . 21
COOLANT LEVEL CHECK-SERVICE . . . . . . . 21
COOLING SYSTEM CLEANING/REVERSE
FLUSHING
DRAINING AND FILLING COOLING SYSTEM . . 21
ROUTINE COOLANT LEVEL CHECK . . . . . . . . 21
REMOVAL AND INSTALLATION
EXTERNAL TRANSMISSION OIL COOLER-
AUXILIARY . . . . . . . . . . . . . . . . . . . . . . . . . . 23
. . 3 AUTOMATIC BELT TENSIONER . . . . . . . . . . . . 41
BELT REPLACEMENT/ADJUSTMENT
COOLING SYSTEM FAN 4.0L ENGINE . . . . . . . 42
COOLING SYSTEM FAN 5.2/5.9L ENGINES . . . 43
ENGINE BLOCK HEATER
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
THERMOSTAT 4.0L ENGINE
THERMOSTAT 5.2/5.9L ENGINES
VISCOUS FAN DRIVE
WATER PUMP 4.0L ENGINE
WATER PUMP 5.2/5.9L ENGINES
WATER PUMP BYPASS HOSE . . . . . . . . . . . . . 36
CLEANING AND INSPECTION
FAN BLADE INSPECTION . . . . . . . . . . . . . . . . 44
RADIATOR CAP . . . . . . . . . . . . . . . . . . . . . . . . 44
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
WATER PUMP INSPECTION
SPECIFICATIONS
COOLING SYSTEM CAPACITIES . . . . . . . . . . . 44
DRIVE BELT TENSION . . . . . . . . . . . . . . . . . . . 44
INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . 44
TORQUE SPECIFICATIONS . . . . . . . . . . . . . . . 45
SPECIAL TOOLS
SPECIAL TOOLS-COOLING . . . . . . . . . . . . . . 45
COOLING SYSTEM
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.
COOLING SYSTEM
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