INSTALLATION
(1) Install the replacement thermostat so that the
pellet, which is encircled by a coil spring, faces the
engine. All thermostats are marked on the outer
flange to indicate the proper installed position.
(a) Observe the recess groove in the engine cyl-
inder head (Fig. 39).
(b) Position thermostat in groove with arrow and
air bleed hole on outer flange pointing up.
(2) Install replacement gasket and thermostat
housing.
CAUTION:
Tightening
the
thermostat
housing
unevenly or with the thermostat out of its recess,
may result in a cracked housing.
(3) Tighten the housing bolts to 22 N·m (16 ft. lbs.)
torque.
(4) Install hoses to thermostat housing.
(5) Install electrical connector to coolant tempera-
ture sensor.
(6) Be sure that the radiator draincock is tightly
closed. Fill the cooling system to the correct level
with the required coolant mixture. Refer to Refilling
Cooling System in this group.
(7) Start and warm the engine. Check for leaks.
THERMOSTAT 5.2/5.9L ENGINES
REMOVAL
WARNING:
DO NOT LOOSEN RADIATOR DRAIN-
COCK WITH SYSTEM HOT AND PRESSURIZED.
SERIOUS BURNS FROM COOLANT CAN OCCUR.
Do not waste reusable coolant. If solution is clean,
drain coolant into a clean container for reuse.
If thermostat is being replaced, be sure that
replacement is specified thermostat for vehicle model
and engine type.
Factory installed thermostat housings on 5.2/5.9L
engines are installed on a gasket with an anti-stick
coating. This will aid in gasket removal and clean-up.
(1) Disconnect negative battery cable at battery.
(2) Drain cooling system until coolant level is
below thermostat. Refer to Draining Cooling System
in this group.
(3) Air
Conditioned
vehicles:
Remove
support
bracket (generator mounting bracket-to-intake mani-
fold) located near rear of generator (Fig. 40).
(4) On air conditioning equipped vehicles, the gen-
erator must be partially removed.
(a) Remove generator drive belt as follows: Drive
belts on the 5.2/5.9L engines are equipped with a
spring loaded automatic belt tensioner (Fig. 41).
(b) Attach a socket/wrench to pulley mounting
bolt of automatic belt tensioner (Fig. 41).
(c) Rotate
tensioner
assembly
clockwise
(as
viewed from front) until tension has been relieved
from belt.
Fig. 39 Thermostat Recess—4.0L Engine
GROOVE
Fig. 40 Generator Support Bracket—5.2/5.9LEngines
GENERATOR/COMPRESSOR
AND
BRACKET
SUPPORT
BRACKET
AUTOMATIC
BELT
TEN-
SIONER
IGNITION COIL BRACKET
IDLER
PULLEY
7 - 30
COOLING SYSTEM
ZG
REMOVAL AND INSTALLATION (Continued)
Summary of Contents for 1997 Grand Cherokee
Page 6: ...FASTENER IDENTIFICATION 4 INTRODUCTION ZG GENERAL INFORMATION Continued ...
Page 9: ...METRIC CONVERSION ZG INTRODUCTION 7 GENERAL INFORMATION Continued ...
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Page 282: ...COOLING SYSTEM DIAGNOSIS DIESEL ENGINE 7 8 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
Page 283: ...ZG COOLING SYSTEM 7 9 DIAGNOSIS AND TESTING Continued ...
Page 284: ...7 10 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
Page 285: ...ZG COOLING SYSTEM 7 11 DIAGNOSIS AND TESTING Continued ...
Page 286: ...7 12 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
Page 290: ...SERPENTINE DRIVE BELT DIAGNOSIS 7 16 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
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Page 423: ...VIC Initial Set Up ZG INSTRUMENT PANEL SYSTEMS 8E 21 SERVICE PROCEDURES Continued ...
Page 424: ...VIC Reset 8E 22 INSTRUMENT PANEL SYSTEMS ZG SERVICE PROCEDURES Continued ...
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Page 1655: ...Fig 3 Oil Lubrication System ZG 5 2L ENGINE 9 57 DESCRIPTION AND OPERATION Continued ...
Page 1684: ...TORQUE 9 86 5 2L ENGINE ZG SPECIFICATIONS Continued ...
Page 1689: ...Fig 3 Oil Lubrication System ZG 5 9L ENGINE 9 91 DESCRIPTION AND OPERATION Continued ...
Page 1723: ...DIAGNOSIS AND TESTING SERVICE DIAGNOSIS DIESEL PERFORMANCE ZG ENGINE 9 3 ...
Page 1724: ...9 4 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1725: ...ZG ENGINE 9 5 DIAGNOSIS AND TESTING Continued ...
Page 1726: ...9 6 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1727: ...ZG ENGINE 9 7 DIAGNOSIS AND TESTING Continued ...
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Page 1729: ...SERVICE DIAGNOSIS DIESEL MECHANICAL ZG ENGINE 9 9 DIAGNOSIS AND TESTING Continued ...
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Page 1762: ...SPECIFICATIONS ENGINE SPECIFICATIONS 9 42 ENGINE ZG ...
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Page 2122: ...DIAGNOSIS AND TESTING NV231 DIAGNOSIS 21 8 TRANSMISSION AND TRANSFER CASE ZG ...