Chrysler 300M 2002 Service Manual page 183

7 - 4 COOLING
COOLING (Continued)
CONDITION
COOLANT LOSS TO THE GROUND
WITHOUT PRESSURE CAP
BLOWOFF. GAUGE IS READING
HIGH OR HOT.
DETONATION OR PRE-IGNITION
(NOT CAUSED BY IGNITION
SYSTEM) GAUGE MAY NOT BE
READING HIGH.
HOSE(S) COLLAPSE AS ENGINE
COOLS DOWN.
ELECTRIC RADIATOR FAN RUNS
ALL THE TIME.
NOISY RADIATOR FAN.
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 too concentrated or too
diluted.
3. Wrong cooling system pressure
cap.
1. Vacuum created in cooling system
on engine cool-down is not being
relieved through coolant bottle
system.
1. Fan relay, Powertrain Control
Module (PCM) or engine coolant
temperature sensor possibly
defective.
2. Check for low coolant level.
3. A/C pressure transducer defective.
1. Fan blade loose.
2. Fan blade striking a surrounding
object.
3. Air obstructions at radiator or A/C
condenser.
4. Electric fan motor defective.
CORRECTION
1. Pressure test and repair as
necessary. (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING -
COOLING SYSTEM LEAK TESTING)
1. Check reason for overheating and
repair as necessary.
2. Check freeze point 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 -
INSPECTION) Replace as necessary.
(b) Hose between the pressure and
overflow container is plugged. Clean
vent 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. (Refer to Appropriate Diagnostic
Information) Repair as necessary.
2. Repair as necessary.
3. (Refer to Appropriate Diagnostic
Information) Repair as necessary.
1. Replace radiator fan assembly.
(Refer to 7 - COOLING/ENGINE/
RADIATOR FAN - REMOVAL)
2. Locate point of fan blade contact
and repair/replace as necessary.
3. Remove obstructions and/or clean
debris.
4. Replace radiator fan assembly.
(Refer to 7 - COOLING/ENGINE/
RADIATOR FAN - REMOVAL)
LH