Cooling 2.5L Turbo Diesel; System - Chrysler Dodge Caravan 2002 Manual

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COOLING 2.5L TURBO DIESEL (Continued)
CONDITION
TEMPERATURE GAUGE
READING IS
INCONSISTENT
(FLUCTUATES, CYCLES
OR IS ERRATIC)
POSSIBLE CAUSES
6. Freeze point of antifreeze not
correct. Mixture may be too rich.
7. Coolant not flowing through

system.

8. Radiator or A/C condensor fins
are dirty or clogged.
9. Radiator core is corroded or
plugged.
10. Aftermarket A/C installed without
proper A/C condensor.
11. Dragging Brakes.
12. Non-factory bug screen is being
used reducing airflow.
13. Thermostat partially or
completely shut. This is more
prevalent on high mileage vehicles.
14. Cylinder head gasket leaking.
15. Heater core leaking.
1. During cold weather operation,
with the heater blower in the high
position, the gauge reading may
drop slightly. Fluctuation is also
influenced by loads, outside
temperature and extended idle time
with diesel engines.
2. Temperature gauge or engine
mounted gauge sensor defective or
shorted. Also, corroded or loose
wiring in this circuit.
3. Gauge reading rises when vehicle
is brought to a stop after heavy use
(engine still running).
4. Gauge reading high after starting
a warm-iup (hot) engine.

COOLING 2.5L TURBO DIESEL

CORRECTION
6. Check antifreeze. Adjust
antifreeze-to-water ratio as
required.
7. Check for coolant flow in
coolant tank with engine warm
and thermostat open. Coolant
should be observed flowing
through the tank. If flow is not
observed, determine reason for
lack of flow and repair as
necessary.
8. Clean debris from radiator or
A/C condensor
9. Have radiator re-cored or
replaced.
10. Install proper A/C
condensor.
11. Check and correct as
necessary.
12. Only a factory screen
should be used.
13. Check thermostat and
replace if necessary.
14. Check cylinder head gasket
for leaks.
15. Check heater cor for leaks.
Repair as necessary.
1. A normal condition. No
correction is necessary.
2. Check operation of gauge
and repair as necessary.
3. A normal condition. No
correction needed. Gauge
should return to normal range
after vehicle is driven.
4. A normal condition. No
correction needed. Gauge
should return to normal after a
few minutes of engine
operation.
7a - 3