COOLING SYSTEM
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
COOLING SYSTEM ........................2
COOLANT RESERVE/OVERFLOW SYSTEM .....2
THERMOSTAT—5.2L/5.9L ENGINES ..........3
THERMOSTAT—4.7L ENGINE ...............4
RADIATOR PRESSURE CAP.................4
RADIATOR ..............................5
WATER PUMP ...........................5
WATER PUMP BYPASS—4.7L...............6
WATER PUMP BYPASS HOSE—5.2L/5.9L
ENGINES ..............................7
AUTOMATIC TRANSMISSION OIL COOLERS....7
AUTOMATIC BELT TENSIONER ..............7
BLOCK HEATER ..........................8
HOSE CLAMPS...........................8
VISCOUS FAN DRIVE ......................9
DIAGNOSIS AND TESTING
ON-BOARD DIAGNOSTICS (OBD) ...........10
DRB SCAN TOOL ........................10
PRELIMINARY CHECKS ...................10
ELECTRIC COOLING FAN ..................15
RADIATOR COOLANT FLOW CHECK .........16
COOLING SYSTEM—TESTING FOR LEAKS....16
VISCOUS FAN DRIVE .....................18
ACCESSORY DRIVE BELT DIAGNOSIS........19
THERMOSTAT—GAS ENGINES .............21
RADIATOR CAP-TO-FILLER NECK
SEAL—PRESSURE RELIEF CHECK.........21
RADIATOR CAP—PRESSURE TESTING.......21
COOLANT—LOW LEVEL AERATION .........22
COOLING SYSTEM—DEAERATION ..........22
SERVICE PROCEDURES
COOLANT—ROUTINE LEVEL CHECK.........22
COOLANT SERVICE ......................22
COOLANT ..............................22
COOLANT SELECTION AND ADDITIVES ......23
COOLANT—ADDING ADDITIONAL...........23
COOLANT LEVEL CHECK ..................23
COOLING SYSTEM—DRAINING AND
FILLING ..............................23
COOLING SYSTEM—CLEANING/REVERSE
FLUSHING ............................24
REMOVAL AND INSTALLATION
COOLANT RESERVE/OVERFLOW TANK .......25
WATER PUMP—5.2L/5.9L ENGINES .........25
WATER PUMP 4.7L ENGINES ..............27
WATER PUMP BYPASS HOSE—5.2L/5.9L
ENGINES .............................30
THERMOSTAT—5.2L/5.9L ENGINE ..........32
THERMOSTAT— 4.7L ENGINE..............34
RADIATOR .............................35
BLOCK HEATER .........................37
ACCESSORY DRIVE BELT—5.2L/5.9L
ENGINE ..............................37
ACCESSORY BELT REPLACEMENT—4.7L
ENGINE ..............................38
AUTOMATIC BELT TENSIONER—5.2L/5.9L
ENGINE ..............................39
AUTOMATIC BELT TENSIONER—4.7L
ENGINE ..............................40
RADIATOR DRAINCOCK ...................40
VISCOUS FAN DRIVE .....................41
CLEANING AND INSPECTION
RADIATOR CAP .........................42
RADIATOR .............................43
WATER PUMP ..........................43
FAN BLADE.............................43
SPECIFICATIONS
COOLING SYSTEM CAPACITIES.............43
COOLING SYSTEM .......................44
SPECIAL TOOLS
COOLING ..............................44
DN COOLING SYSTEM 7 - 1
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