Jeep 1997 Grand Cherokee Service Manual page 257

STEERING, THIS WILL BE AN IDLER PULLEY. *IF VEHICLE IS NOT EQUIPPED WITH POWER AUTOMATIC TEN- SIONER
GEN.
ZG
REMOVAL AND INSTALLATION (Continued)
CAUTION: When installing the serpentine acces-
sory drive belt, belt must be routed correctly. If not,
engine may overheat due to water pump rotating in
wrong direction. Refer to (Fig. 37) for correct belt
routing. Or, refer to the Belt Routing Label located
in the engine compartment. The correct belt with
correct length must be used.
Fig. 37 Belt Routing—5.2/5.9L Engines
(11) Position fan shroud and fan blade/viscous fan
drive assembly to vehicle as a complete unit.
(12) Be sure the upper and lower portions of the
fan shroud are firmly connected. All air must flow
through the radiator.
(13) Install two fan shroud-to-radiator nuts (Fig.
33).
(14) Be sure of at least 25 mm (1.0 inches)
between tips of fan blades and fan shroud.
(15) Install fan blade/viscous fan drive assembly to
water pump shaft.
(16) Fill cooling system. Refer to Refilling the
Cooling System in this group.
(17) Connect negative battery cable.
(18) Start and warm the engine. Check for leaks.
THERMOSTAT 4.0L ENGINE
REMOVAL
WARNING: DO NOT LOOSEN THE RADIATOR
DRAINCOCK WITH THE SYSTEM HOT AND PRES-
SURIZED. SERIOUS BURNS FROM THE COOLANT
CAN OCCUR.
IDLER PULLEY WAT.PUMP IF W/OUT A/C
CRANK A/C COMP. PWR. STRG.
PULLEY PUMP
LONG BOLT SHORT BOLT
Do not waste reusable coolant. If the solution is
clean, drain the coolant into a clean container for
reuse.
(1) Drain the coolant from the radiator until the
level is below the thermostat housing.
WARNING: CONSTANT TENSION HOSE CLAMPS
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, USE ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER
6094) (Fig. 53). SNAP-ON CLAMP TOOL (NUMBER
HPC-20) MAY BE USED FOR LARGER CLAMPS.
ALWAYS WEAR SAFETY GLASSES WHEN SERVIC-
ING CONSTANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps (Fig. 54). If
replacement is necessary, use only an original
equipment clamp with matching number or letter.
(2) Remove radiator upper hose and heater hose at
thermostat housing.
(3) Disconnect wiring connector at engine coolant
temperature sensor.
(4) Remove thermostat housing mounting bolts,
thermostat housing, gasket and thermostat (Fig. 38).
Discard old gasket.
Fig. 38 Thermostat Removal/Installation—
4.0LEngine
(5) Clean the gasket mating surfaces.
GASKET THERMOSTAT HOUSING THERMOSTAT
COOLING SYSTEM 7 - 29