Chrysler 300M Service Manual page 191

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