Jeep Wrangler 2001 Service Manual page 19

7s - 4 COOLING
COOLING (Continued)
CONDITION
2001 JEEP WRANGLER
POSSIBLE CAUSES
3. Is the temperature warning
illuminating unnecessarily?
4. Coolant low in coolant reserve/
overflow tank and radiator?
5. Pressure cap not installed tightly.
If cap is loose, boiling point of
coolant will be lowered. Also refer
to the following Step 6.
6. Poor seals at the radiator cap.
7. Coolant level low in radiator but
not in coolant reserve/overflow
tank. This means the radiator is not
drawing coolant from the coolant
reserve/overflow tank as the engine
cools
8. Incorrect coolant concentration
9. Coolant not flowing through
system
10. Radiator or A/C condenser fins
are dirty or clogged.
11. Radiator core is corroded or
plugged.
12. Aftermarket A/C installed
without proper radiator.
CORRECTION
3. (Refer to 8 - ELECTRICAL/
INSTRUMENT CLUSTER -
SCHEMATIC - ELECTRICAL).
4. Check for coolant leaks and
repair as necessary. (Refer to 7 -
COOLING - DIAGNOSIS AND
TESTING).
5. Tighten cap
6. (a) Check condition of cap and
cap seals. Refer to Radiator Cap.
Replace cap if necessary.
(b) Check condition of radiator filler
neck. If neck is bent or damaged,
replace radiator.
7. (a) Check condition of radiator
cap and cap seals. Refer to
Radiator Cap in this Group. Replace
cap if necessary.
(b) Check condition of radiator filler
neck. If neck is bent or damaged,
replace radiator.
(c) Check condition of the hose from
the radiator to the coolant tank. It
should fit tight at both ends without
any kinks or tears. Replace hose if
necessary.
(d) Check coolant reserve/overflow
tank and tanks hoses for blockage.
Repair as necessary.
8. Check coolant. (Refer to
LUBRICATION & MAINTENANCE/
FLUID TYPES - DESCRIPTION).
9. Check for coolant flow at radiator
filler neck with some coolant
removed, engine warm and
thermostat open. Coolant should be
observed flowing through radiator. If
flow is not observed, determine area
of obstruction and repair as
necessary.
10. Remove insects and debris.
(Refer to 7 - COOLING -
STANDARD PROCEDURE).
11. Have radiator re-cored or
replaced.
12. Install proper radiator.
TJ