Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_7
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XJ COOLING SYSTEM 7-1
COOLING SYSTEM
CONTENTS
page page
GENERAL INFORMATION RADIATOR CAP--PRESSURE TESTING . . . . . 20
ACCESSORY DRIVE BELT TENSION . . . . . . . . . . 2 RADIATOR COOLANT FLOW CHECK . . . . . . . . 17
ACCESSORY DRIVE BELTS . . . . . . . . . . . . . . . . 2 VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . 18
BLOCK HEATER . . . . . . . . . . . . . . . . . . . . . . . . . 3 SERVICE PROCEDURES
COOLANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 COOLANT--ADDING ADDITIONAL . . . . . . . . . . 21
COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . 2 COOLANT--LEVEL CHECK . . . . . . . . . . . . . . . . 21
COOLING SYSTEM CIRCULATION . . . . . . . . . . . 2 COOLANT--ROUTINE LEVEL CHECK . . . . . . . . 20
COOLING SYSTEM COMPONENTS . . . . . . . . . . 2 COOLING SYSTEM--DRAINING
RADIATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 AND FILLING . . . . . . . . . . . . . . . . . . . . . . . . 21
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . 2 COOLING SYSTEM--REVERSE FLUSHING . . . 21
DESCRIPTION AND OPERATION REMOVAL AND INSTALLATION
ACCESSORY DRIVE BELT TENSION . . . . . . . . . . 4 BLOCK HEATER . . . . . . . . . . . . . . . . . . . . . . . . 34
AUTOMATIC TRANSMISSION OIL COOLER . . . . 3 COOLANT RESERVE TANK . . . . . . . . . . . . . . . . 22
BLOCK HEATER . . . . . . . . . . . . . . . . . . . . . . . . . 4 COOLING SYSTEM FANS . . . . . . . . . . . . . . . . . 36
COOLANT PERFORMANCE . . . . . . . . . . . . . . . . . 4 ELECTRIC COOLING FAN--2.5L . . . . . . . . . . . 32
COOLANT RESERVE/OVERFLOW SYSTEM . . . . 3 ELECTRIC COOLING FAN--4.0L . . . . . . . . . . . 32
COOLANT SELECTION-ADDITIVES . . . . . . . . . . . 5 ENGINE ACCESSORY DRIVE BELTS . . . . . . . . . 34
COOLING SYSTEM FANS . . . . . . . . . . . . . . . . . . 4 RADIATOR--2.5L . . . . . . . . . . . . . . . . . . . . . . . 28
COOLING SYSTEM HOSES . . . . . . . . . . . . . . . . . 6 RADIATOR--4.0L . . . . . . . . . . . . . . . . . . . . . . . 30
ELECTRIC COOLING FAN . . . . . . . . . . . . . . . . . . 8 THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . 27
RADIATOR PRESSURE CAP . . . . . . . . . . . . . . . . 5 TRANSMISSION OIL COOLERS . . . . . . . . . . . . 22
THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 VISCOUS FAN DRIVE REMOVAL/
VISCOUS FAN DRIVE . . . . . . . . . . . . . . . . . . . . . 7 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 37
WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . 6 WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . 23
DIAGNOSIS AND TESTING CLEANING AND INSPECTION
ACCESSORY DRIVE BELT DIAGNOSIS . . . . . . . . 8 COOLING SYSTEM CLEANING . . . . . . . . . . . . . 38
COOLANT--LOW LEVEL AERATION . . . . . . . . 20 COOLING SYSTEM HOSES . . . . . . . . . . . . . . . . 38
COOLING SYSTEM DIAGNOSIS CHART . . . . 11 FAN BLADE INSPECTION . . . . . . . . . . . . . . . . . 38
COOLING SYSTEM--TESTING FOR LEAKS . . . 17 RADIATOR CLEANING . . . . . . . . . . . . . . . . . . . 38
DEAERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 20 RADIATOR PRESSURE CAP . . . . . . . . . . . . . . . 38
DRB SCAN TOOL . . . . . . . . . . . . . . . . . . . . . . . . 8 SPECIFICATIONS
ELECTRIC COOLING FAN . . . . . . . . . . . . . . . . . 19 BELT TENSION . . . . . . . . . . . . . . . . . . . . . . . . . 38
ON-BOARD DIAGNOSTICS (OBD) . . . . . . . . . . . 8 TORQUE SPECIFICATIONS . . . . . . . . . . . . . . . . 39
PRELIMINARY CHECKS . . . . . . . . . . . . . . . . . . 11 SPECIAL TOOLS
RADIATOR CAP-TO-FILLER NECK SEAL-- COOLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
PRESSURE RELIEF CHECK . . . . . . . . . . . . . . 19
7-2 COOLING SYSTEM XJ
GENERAL INFORMATION
ACCESSORY DRIVE BELTS
CAUTION: When installing an accessory drive belt,
the belt MUST be routed correctly. If not, the engine
may overheat due to water pump rotating in wrong
direction. Refer to the appropriate Belt Schematic in
this group for the correct belt routing. Or, refer to
the Belt Routing Label located in the engine com-
partment.
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.
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. Vehicles equipped with a 2.5L/4.0L
engine and heavy duty cooling and/or air condition- Fig. 1 Coolant Circulation--2.5L/4.0L Engines
ing also have an auxiliary electric cooling fan.
COOLANT
COOLING SYSTEM COMPONENTS The cooling system is designed around the coolant.
The cooling system consists of: Coolant flows through the engine water jackets
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