
The coolant reserve/overflow system consists of a
radiator mounted pressurized cap, a plastic reserve/
overflow tank (Figs. 21, 22 or 23), a tube connecting
the radiator and tank, and an overflow tube on the
side of the tank.
TANK REMOVAL/INSTALLATION
(1) Remove the tube clamp at the tank and remove
tube.(2) On YJ models, remove the windshield washer
reservoir and its mounting bracket.
(3) Remove the tank mounting bolts and remove
tank.
(4) Reverse the preceding steps for installation.
RADIATOR PRESSURE CAP
All radiators are equipped with a pressure cap.
This cap releases pressure at some point within a
range of 83-110 kPa (12-16 psi). The pressure relief
point (in pounds) is engraved on top of the cap (Fig.
24).
The cooling system will operate at pressures
slightly above atmospheric pressure. This results in a
higher coolant boiling point allowing increased radi-
ator cooling capacity. The cap (Fig. 24) contains a
spring-loaded pressure relief valve. This valve opens
when system pressure reaches the release range of
83-110 kPa (12-16 psi).
A vent valve in the center of the cap allows a small
coolant flow through the cap when coolant is below
boiling temperature. The valve is completely closed
when boiling point is reached. As coolant cools, it
contracts and creates a vacuum in the cooling sys-
tem. This causes the vacuum valve to open and cool-
ant in reserve/overflow tank to be drawn through
connecting hose into radiator. If the vacuum valve is
stuck shut, radiator hoses will collapse on cool-down.
A rubber gasket seals the radiator filler neck. This
is done to maintain vacuum during coolant cool-down
and to prevent leakage when system is under pres-
sure.
Fig. 21 Reserve/Overflow TankÐYJ Models
Fig. 22 Reserve/Overflow TankÐXJ ModelsÐExcept
Right Hand Drive
Fig. 23 Reserve/Overflow TankÐXJ ModelsÐWith
Right Hand Drive
7 - 20 COOLING SYSTEMJ

TEMPERATURE SENSOR TEST, ENGINE
COOLANT; FUEL SYSTEM..............14-43
TEMPERATURE SENSOR TEST, ENGINE
COOLANT; IGNITION SYSTEMS..........8D-12
TEMPERATURE SENSOR TEST, INTAKE
AIR ...............................14-43
TEMPERATURE SENSOR TEST, INTAKE
MANIFOLD AIR......................8D-14
TENSION, BELT.......................8B-10
TENSION, DRIVE BELT...............7-33,7-38
TENSIONÐRIGHT HAND DRIVE
(RHD),BELT..........................7-34
TENSION SPECIFICATIONS, BELT...........7-34
TENSIONER REPLACEMENT (XJ), PARKING
BRAKE CABLE........................5-61
TENSIONERÐXJ MODELS, AUTOMATIC
BELT ...............................7-36
TERMINAL ASSEMBLY REPLACEMENT,
CONNECTOR.........................8W-5
TERMINAL REPLACEMENT...............8W-5
TEST, A/C PERFORMANCE................24-8
TEST, ACTUATOR MOTOR STALL...........8P-6
TEST, AIR PRESSURE...................21-73
TEST, ANALYZING THE ROAD.............21-70
TEST, BATTERY LOAD...................8A-4
TEST, BATTERY OPEN CIRCUIT VOLTAGE....8A-3
TEST, CAMSHAFT POSITION SENSOR;
FUEL SYSTEM.......................14-43
TEST, CAMSHAFT POSITION SENSOR;
IGNITION SYSTEMS...................8D-8
TEST, CONVERTER STALL...............21-72
TEST, CRANKSHAFT POSITION SENSOR;
FUEL SYSTEM.......................14-44
TEST, CRANKSHAFT POSITION SENSOR;
IGNITION SYSTEMS...................8D-9
TEST, CYLINDER COMBUSTION
PRESSURE LEAKAGE...................9-6
TEST, CYLINDER COMBUSTION
PRESSURE LEAKAGE DIAGNOSIS..........9-6
TEST, CYLINDER COMPRESSION PRESSURE . . 9-5
TEST, ENGINE COOLANT TEMPERATURE
SENSOR......................8D-12,14-43
TEST, EXTENDED IDLE SWITCH...........14-45
TEST, FUEL PRESSURE LEAK DOWN........14-7
TEST, FUEL PUMP CAPACITY..............14-7
TEST, FUEL SYSTEM PRESSURE......14-5,14-48
TEST, HYDRAULIC PRESSURE......21-71,21-168
TEST, HYDROMETER....................8A-3
TEST, IDLE AIR CONTROL MOTOR........14-46
TEST, INJECTOR.......................14-48
TEST, INTAKE AIR TEMPERATURE SENSOR . . 8D-14,
14-43
TEST, MANIFOLD ABSOLUTE PRESSURE
(MAP) SENSOR.................8D-14,14-44
TEST, MANUAL SHIFTING...............21-168
TEST, MASTER CYLINDER/POWER
BOOSTER............................5-11
TEST, OXYGEN SENSOR (O2S)
HEATING ELEMENT...................14-45
TEST, POWER BOOSTER CHECK VALVE......5-11
TEST, POWER BOOSTER VACUUM..........5-12
TEST PROCEDURES, BATTERY............8A-2
TEST PROCEDURES ON VEHICLE,
ENGINE STARTER MOTOR..............8A-9
TEST PROCEDURES ON VEHICLE,
GENERATOR........................8A-14
TEST, PUMP PRESSURE.................19-3
TEST, REAR WINDOW DEFOGGER GRID.....8N-1
TEST, REFRIGERANT LEAK................24-8
TEST, ROAD; TRANSMISSION AND
TRANSFER CASE.....................21-70
TEST, ROAD; VEHICLE SPEED CONTROL
SYSTEM............................8H-5
TEST SPECIFICATIONS, 30RH/32RH
PRESSURE........................21-323
TEST, SPEED CONTROL SWITCH (TURN
SIGNAL LEVER)......................8H-7
TEST, STARTER MOTOR RELAY...........14-48
TEST, STARTING SYSTEM COLD
CRANKING...........................8A-9
TEST, STOP LAMP SPEED CONTROL
SWITCH
............................8H-7
TEST, THROTTLE POSITION SENSOR
......8D-18
TEST, THROTTLE POSITION SENSOR
(TPS)
..............................14-45
TEST, TIME LAG
......................21-169TEST, TORQUE CONVERTER CLUTCH
RELAY.............................14-45
TEST, TORQUE CONVERTER STALL.......21-169
TEST, VACUUM SUPPLY.................8H-7
TEST, VEHICLE SPEED SENSOR......8H-5,14-45
TESTING, AUTOMATIC SHUTDOWN
(ASD) RELAY........................14-43
TESTING COOLING SYSTEM FOR LEAKS.....7-18
TESTING, FUEL PUMP RELAY............14-44
TESTING GENERAL INFORMATION,
BATTERY............................8A-3
TESTING, IGNITION SWITCH.............8D-30
TESTING, POWER MIRROR SWITCH........8T-2
TESTING, REAR WIPER/WASHER
SWITCH.......................8K-7,8K-14
TESTING, SWITCH; POWER SEATS.........8R-2
TESTING, SWITCH; POWER WINDOWS......8S-5
TESTING, SWITCH; REAR WINDOW
DEFOGGER..........................8N-2
TESTING, TRANSMISSION COOLER FLOW . . 21-106
TESTING, WIPER SWITCH...............8K-19
TESTS - (VOLTAGE DROP METHOD),
STARTER FEED CIRCUIT................8A-9
TESTS, ANTENNA.......................8F-9
TESTS AT POWERTRAIN CONTROL
MODULE, ELECTRICAL.................8H-6
TESTS AT SERVO, ELECTRICAL............8H-5
TESTS, COMPRESSOR VALVE PLATEÐ
LEAK...............................24-8
TESTS, IGNITION SWITCH CONTINUITY....8D-31
TESTS, OXYGEN SENSOR...............8D-19
TESTS, STARTER CONTROL CIRCUIT......8A-11
TESTS, VEHICLE SPEED CONTROL
SYSTEM............................8H-5
TESTS, WATER PUMP....................7-9
THERMOMETER AND SENSOR SYSTEM
REPAIR PROCEDURES.................8C-6
THERMOSTAT..........................7-13
THERMOSTAT, TEMPERATURE CONTROL . . . 24-35
THICKNESS, AW-4 CLUTCH DISC AND
PLATE ............................21-325
THICKNESS, DISC BRAKE ROTOR..........5-31
THICKNESS VARIATION, DISC BRAKE
ROTOR.............................5-31
THIRD GEAR (CONVERTER CLUTCH
ENGAGED), HYDRAULIC FLOW IN.......21-90
THIRD GEAR, HYDRAULIC FLOW IN D
RANGE.............................21-89
THREAD NOTATIONÐSAE AND METRIC . . INTRO.-9
THREADS, REPAIR DAMAGED OR WORN.....9-4
THROTTLE 3-2 DOWNSHIFT, HYDRAULIC
FLOW DURING FULL..................21-92
THROTTLE 3-2 DOWNSHIFT, HYDRAULIC
FLOW DURING PART..................21-91
THROTTLE BODY; FUEL SYSTEM.....14-29,14-59
THROTTLE CABLE.....................14-16
THROTTLE CABLE, ACCELERATOR PEDAL . . 14-16,
14-54
THROTTLE CABLE ADJUSTMENT,
TRANSMISSION.....................21-185
THROTTLE CABLE ADJUSTMENT,
TRANSMISSION......................21-98
THROTTLE CABLE REPLACEMENT,
TRANSMISSION.....................21-184
THROTTLE POSITION SENSOR............8D-6
THROTTLE POSITION SENSOR TEST.......8D-18
THROTTLE POSITION SENSOR (TPS);
FUEL SYSTEM.......................14-59
THROTTLE POSITION SENSOR (TPS);
IGNITION SYSTEMS..................8D-29
THROTTLE POSITION SENSOR (TPS)
SERVICE..........................21-184
THROTTLE POSITION SENSOR (TPS)
TEST..............................14-45
THROTTLE POSITION SENSOR (TPS)Ð
PCM INPUT.........................14-23
THROTTLE VALVE CABLE ADJUSTMENT,
TRANSMISSION......................21-70
TIE ROD ........................19-14,19-17
TIGHTENING, WHEEL NUT............5-32,5-37
TILT STEERING COLUMN................19-59
TIME LAG TEST
......................21-169
TIMING CASE COVER
................9-27,9-67
TIMING CASE COVER OIL SEAL
REPLACEMENT
...................9-26,9-67
TIMING CHAIN AND SPROCKETS
......9-28,9-68TIMING, IGNITION.....................8D-14
TIMING, VALVE.....................9-26,9-66
TIPS, TRANSMISSION ASSEMBLY........21-146
TIRE AND WHEEL BALANCE..............22-6
TIRE AND WHEEL RUNOUT...............22-8
TIRE CARRIER, EXTERNAL SPARE/WHEEL . 23-172
TIRE INFLATION PRESSURE LABEL.....INTRO.-3
TIRE INFLATION PRESSURES.............22-2
TIRE NOISE OR VIBRATION...............22-4
TIRE WEAR PATTERNS..................22-4
TIRES; LUBRICATION AND MAINTENANCE....0-34
TIRES................................22-1
TIRES, CLEANING OF....................22-2
TIRES, REPLACEMENT...................22-2
TIRE/WHEEL HOLDDOWN AND FLOOR
BRACKETS.........................23-128
TOOL, DRB SCAN; COOLING SYSTEM........7-5
TOOL, DRB SCAN; EMISSION CONTROL
SYSTEMS...........................25-2
TOOL, DRB SCAN; FUEL SYSTEM.........14-51
TOOL, DRB SCAN; IGNITION SYSTEMS.....8D-10
TOP REPAIR, HARD...................23-165
TOP ROOF VENT......................23-165
TOP SERVICE............23-164,23-166,23-167
TORQUE; COOLING SYSTEM..............7-39
TORQUE; FUEL SYSTEM................14-62
TORQUE; IGNITION SYSTEMS............8D-33
TORQUE, COLLISION DAMAGE............13-1
TORQUE CONVERSION..............INTRO.-10
TORQUE CONVERTER; TRANSMISSION
AND TRANSFER CASE...........21-66,21-158
TORQUE CONVERTER CLUTCH RELAY......14-60
TORQUE CONVERTER CLUTCH RELAY
TEST..............................14-45
TORQUE CONVERTER CLUTCH RELAYÐ
PCM OUTPUT.......................14-27
TORQUE CONVERTER INSTALLATION,
TRANSMISSION.....................21-190
TORQUE CONVERTER REMOVAL,
TRANSMISSION.....................21-189
TORQUE CONVERTER STALL TEST.......21-169
TORQUE CONVERTER STATOR CLUTCH
INSPECTION.......................21-189
TORQUE SPECIFICATIONS, 30RH/32RH....21-323
TORQUE SPECIFICATIONSÐ AX 15
MANUAL TRANSMISSION.............21-320
TORQUE SPECIFICATIONSÐACCESSORIES . 23-208
TORQUE SPECIFICATIONS, AW-4
.........21-331
TORQUE SPECIFICATIONS, BATTERY
.......8B-10
TORQUE SPECIFICATIONS; BATTERY/
STARTER/GENERATOR SERVICE
.........8B-12
TORQUE SPECIFICATIONS, BRAKE
..........5-67
TORQUE SPECIFICATIONS; CLUTCH
........6-17
TORQUE SPECIFICATIONS; ELECTRICAL
.....8A-8
TORQUE SPECIFICATIONS; ENGINES
....9-49,9-89
TORQUE SPECIFICATIONS; EXHAUST
SYSTEM AND INTAKE MANIFOLD
........11-10
TORQUE SPECIFICATIONS; FRONT
SUSPENSION AND AXLE
................2-47
TORQUE SPECIFICATIONS; HEATING AND
AIR CONDITIONING
...................24-45
TORQUE SPECIFICATIONS; HORNS
.........8G-3
TORQUE SPECIFICATIONS;
INTRODUCTION
...................INTRO.-8
TORQUE SPECIFICATIONS, NP231/NP242
. . 21-331
TORQUE SPECIFICATIONS; PROPELLER
SHAFTS
............................16-14
TORQUE SPECIFICATIONS; REAR
SUSPENSION AND AXLES
...............3-50
TORQUE SPECIFICATIONS, STARTER
MOTOR
............................8B-11
TORQUE SPECIFICATIONS; STEERING
......19-73
TORQUE SPECIFICATIONS XJ
.............8K-7
TORQUE SPECIFICATIONSÐXJ VEHICLES
. . 23-207
TORQUE VALUES, STANDARD
.........INTRO.-9
TOW HOOKÐXJ VEHICLES, REAR
.........23-87
TOW HOOKS
..........................13-14
TOW HOOKS, FRONT
....................13-5
TOWING, JUMP STARTING, HOISTING
.......0-7
TOWING RECOMMENDATIONS
..............0-8
TRACK BAR
....................2-10,2-13,3-6
TRACKS, BUCKET SEAT PLATFORM
.......23-105
TRAC-LOK DIFFERENTIAL
................3-44
JINDEX23
Description Group-Page Description Group-Page Description Group-Page