Jeep 1997 Grand Cherokee Service Manual page 258

GROOVE
7 - 30 COOLING SYSTEM
REMOVAL AND INSTALLATION (Continued)
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.
Fig. 39 Thermostat Recess—4.0L Engine
(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.
IDLER PULLEY GENERATOR/COMPRESSOR SUPPORT IGNITION COIL BRACKET BRACKET BRACKET AND
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).
Fig. 40 Generator Support Bracket—5.2/5.9LEngines
(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.
AUTOMATIC BELT SIONER TEN-
ZG