Cleaning And Inspection; Fan Blade Inspection; Radiator Cap; Radiator - Jeep 1997 Grand Cherokee Service Manual

7 - 44 COOLING SYSTEM

CLEANING AND INSPECTION

RADIATOR CAP

INSPECTION
Visually inspect the pressure valve gasket on the
cap. Replace cap if the gasket is swollen, torn or
worn. Inspect the area around radiator filler neck for
white deposits that indicate a leaking cap.

RADIATOR

CLEANING
The radiator and air conditioning fins should be
cleaned when an accumulation of bugs, leaves etc.
has occurred. Clean radiator fins are necessary for
good heat transfer. With the engine cold, apply cold
water and compressed air to the back (engine side) of
the radiator to flush the radiator and/or A/C con-
denser of debris.

FAN BLADE INSPECTION

The fan blades cannot be repaired. If the fan is
damaged, it must be replaced. Inspect the fan blades
as follows:
Lay fan blade assembly on a flat surface with lead-
ing edge facing down. With tip of blade touching flat
surface, replace fan if clearance between opposite
blade and surface is greater than 2.0 mm (.090 inch).
Rocking motion of opposite blades should not exceed
2.0 mm (.090 inch). Test all blades in this manner.
WARNING: IF FAN IS NOT WITHIN SPECIFICA-
TIONS, DO NOT
STRAIGHTEN FAN.
Inspect fan assembly for cracks, bends, loose rivets
or broken welds. Replace fan if any damage is found.
CAUTION: If the fan blade assembly is replaced
because of mechanical damage, the water pump
and viscous fan drive should also be inspected.
These components could have been damaged due
to excessive vibration.

WATER PUMP INSPECTION

Replace water pump assembly if it has any of the
following conditions:
• The body is cracked or damaged
ATTEMPT TO BEND
• Water leaks from shaft seal. This is evident by
traces of coolant below vent hole
• Loose or rough turning bearing. Also inspect vis-
cous fan drive
• Impeller rubs either the pump body or timing
chain case/cover

SPECIFICATIONS

INFORMATION

The following specifications are published from the
latest information available at the time of publica-
tion. If anything differs between the specifica-
tions found on the Vehicle Emission Control
Information (VECI) label and the following
specifications, use specifications on VECI label.
The VECI label is located in the engine compart-
ment. Refer to Group 25, Emission System for more
information on the VECI label.

COOLING SYSTEM CAPACITIES

4.0L (6 cyl. eng.) *
• 11.4 L (12.0 quarts)
5.2/5.9L (8 cyl. eng.) *
• 14.1 L (14.9 quarts)
* Includes coolant recovery bottle capacity

DRIVE BELT TENSION

4.0L (6 cyl. eng.)
• *
(With
OR
(180–200 lbs. force)
4.0L (6 cyl. eng.)
• * (With used serpentine belt) 623–712 N
(140–160 lbs. force)
5.2/5.9L (V-8 eng.)
• Do not attempt to check belt tension with a ten-
sion gauge. System is equipped with an automatic
tensioner. Refer to Automatic Belt Tensioner if Group
7, Cooling System
NOTE: * Specifications for use with a belt tension
gauge. Refer to operating instructions supplied with
gauge.
new serpentine belt)
ZG
800–900 N