Jeep 200 Cherokee Service Manual page 301

7 - 12 COOLING SYSTEM
DIAGNOSIS AND TESTING (Continued)
CONDITION
COOLANT LOSS TO THE
GROUND WITHOUT
PRESSURE CAP BLOWOFF.
GAUGE IS READING HIGH
OR HOT
HOSE OR HOSES COLLAPSE
WHEN ENGINE IS COOLING
NOISY FAN
INADEQUATE AIR
CONDITIONER
PERFORMANCE (COOLING
SYSTEM SUSPECTED)
2000 JEEP CHEROKEE
POSSIBLE CAUSES
1. Coolant leaks in radiator, cooling
system hoses, water pump or engine.
1. Vacuum created in cooling system on
engine cool-down is not being relieved
through pressure/vent cap.
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 (roaring)
may be evident on models equipped with
a thermal viscous fan drive. Some of this
noise is normal.
1. Radiator and/or A/C condenser is
restricted, obstructed or dirty (insects,
leaves etc.).
2. Thermal viscous fan drive is
freewheeling.
3. Engine is overheating (heat may be
transferred from radiator to A/C
condenser. High underhood temperatures
due to engine overheating may also
transfer heat to A/C components).
4. The cooling system is equipped with
air seals at the radiator and/or A/C
condenser. If these seals are missing or
damaged, not enough air flow will be
pulled through the radiator and A/C
condenser.
CORRECTION
1. Pressure test and repair as
necessary. Refer to Testing Cooling
System For Leaks in this group.
1. Cap relief valve stuck. Refer to
Pressure/Vent Cap in this group.
Replace if necessary.
1. Replace fan blade assembly.
Refer to Cooling Sytem Fans in this
group.
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 Viscous Fan
Drive in this group.
5. Refer to Viscous Fan Drive in
this group for an explanation of
normal fan noise.
1. Remove restriction and/or clean
as necessary. Refer to Radiator
Cleaning in this group.
2. Refer to Viscous Fan Drive for
diagnosis. Repair as necessary.
3. Correct overheating condition.
Refer to text in Group 7, Cooling.
4. Check for missing or damaged
air seals and repair as necessary.
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