COOLING SYSTEM
TABLE OF CONTENTS
page page
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
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
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-
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
XJ COOLING SYSTEM 7 - 1
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