Chrysler Dodge Caravan 2002 Manual page 265

7 - 16 ENGINE
ENGINE (Continued)
CONDITION
DETONATION OR PRE-IGNITION
(NOT CAUSED BY IGNITION
SYSTEM). GAUGE MAY NOT BE
READING HIGH.
HOSE(S) COLLAPSE AS ENGINE
COOLS DOWN.
INADEQUATE AIR CONDITIONER
PERFORMANCE (COOLING
SYSTEM SUSPECTED).
INADEQUATE HEATER
PERFORMANCE.
POSSIBLE CAUSES
1. Engine overheating.
2. Freeze point of coolant not
correct. Mixture too concentrated or
too diluted.
3. Incorrect cooling system
pressure cap.
1. Vacuum created in cooling
system on engine cool-down is not
being relieved through coolant
recovery system.
1. Radiator and/or A/C condenser is
restricted, obstructed, or dirty
(insects, leaves, etc.).
2. Electrical radiator fan not
operating when A/C is operated.
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. All models are 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.
1. Check for a Diagnostic trouble
code (DTC).
2. Coolant level low.
CORRECTION
1. Check reason for overheating
and repair as necessary.
2. Check concentration level of the
coolant. (Refer to 7 - COOLING/
ENGINE/COOLANT - DIAGNOSIS
AND TESTING) Adjust the ethylene
glycol-to-water ratio as required.
3. Install correct pressure cap.
1. (a) Pressure cap relief valve
stuck. (Refer to 7 - COOLING/
ENGINE/RADIATOR PRESSURE
CAP - DIAGNOSIS AND TESTING)
Replace as necessary.
(b) Hose between the radiator and
overflow container is plugged or
pinched. Clean and repair as
necessary.
(c) Vent at coolant reserve/overflow
container is plugged. Clean vent
and repair as necessary.
(d) Reserve/overflow container is
internally blocked. Clean and repair
as necessary.
1. Remove restriction and/or clean
as necessary.
2. For test procedure (Refer to
appropriate Diagnostic Information).
Repair as necessary.
3. Correct overheating condition.
4. Check for missing or damaged air
seals and repair as necessary.
1. For procedures, (Refer to
appropriate Diagnostic Information).
Repair as necessary.
2. (Refer to 7 - COOLING -
STANDARD PROCEDURE) Repair
as necessary.
RS