Chrysler Vehicle User Manual page 276

TJ
COOLING (Continued)
CONDITION
COOLANT LOSS TO THE
GROUND WITHOUT PRESSURE
CAP BLOWOFF. GAUGE READING
HIGH OR HOT
DETONATION OR PRE-IGNITION
(NOT CAUSED BY IGNITION
SYSTEM). GAUGE MAY OR MAY
NOT BE READING HIGH
HOSE OR HOSES COLLAPSE
WHILE ENGINE IS RUNNING
NOISY VISCOUS FAN/DRIVE
POSSIBLE CAUSES
1. Coolant leaks in radiator, cooling
system hoses, water pump or
engine.
1. Engine overheating.
2. Freeze point of coolant not
correct. Mixture is too rich or too
lean.
1. Vacuum created in cooling
system on engine cool-down is not
being relieved through coolant
reserve/overflow system.
1. Fan blades loose.
2. Fan blades striking a surrounding
object.
3. Air obstructions at radiator or air
conditioning condenser.
4. Thermal viscous fan drive has
defective bearing.
5. A certain amount of fan noise
may be evident on models
equipped with a thermal viscous fan
drive. Some of this noise is normal.
COOLING
CORRECTION
1. Pressure test and repair as
necessary. (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING).
1. Check reason for overheating
and repair as necessary.
2. Check coolant concentration.
(Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
DESCRIPTION).
1. (a) Radiator cap relief valve
stuck. (Refer to 7 - COOLING/
ENGINE/RADIATOR PRESSURE
CAP - DIAGNOSIS AND TESTING).
Replace if necessary
(b) Hose between coolant
reserve/overflow tank and radiator is
kinked. Repair as necessary.
(c) Vent at coolant reserve/overflow
tank is plugged. Clean vent and
repair as necessary.
(d) Reserve/overflow tank is
internally blocked or plugged. Check
for blockage and repair as
necessary.
1. Replace fan blade assembly.
(Refer to 7 - COOLING/ENGINE/
RADIATOR FAN - REMOVAL)
2. Locate point of fan blade contact
and repair as necessary.
3. Remove obstructions and/or
clean debris or insects from radiator
or A/C condenser.
4. Replace fan drive. Bearing is not
serviceable. (Refer to 7 - COOLING/
ENGINE/FAN DRIVE VISCOUS
CLUTCH - REMOVAL).
5. (Refer to 7 - COOLING/ENGINE/
FAN DRIVE VISCOUS CLUTCH -
DESCRIPTION) for an explanation
of normal fan noise.
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