TM 9-2320-297-24-1
ENGINE COOLING
DIAGNOSTIC FLOWCHART
KNOWN INFO
NONE
POSSIBLE
PROBLEMS
COOLING COMPONENTS
SERPENTINE
BELT
WATER PUMP 8 PULLEY
KNOWN INFO
COOLANT QUALITY OK
POSSIBLE
PROBLEMS
COOLANT LEVEL
COOLING COMPONENTS
SERPENTINE
BELT
WATER PUMP 8 PULLEY
I
KNOWN INFO
COOLANT OK
1 POSSIBLE
PROBLEMS
THERMOSTAT
COOLING COMPONENTS
SERPENTINE
BELT
WATER PUMP & PULLEY
IS THE COOLANT MIXTURE
CORRECT?
(SEE CHART ON PAGE 2-159.)
IS THE COOLANT AT THE
CORRECT LEVEL?
IS THE THERMOSTAT WORKING
PROPERLY?
;T OPllONS
1 .COOLANT MIXTURE TEST
KIT NSN 6630-0@169-1 SO6
P.CDOlANT
TESTER
NSN 6630-00-105-1416
REASON FOR QUESTION
The cooling system will not operate
property if the mixture is incorrect.
r OPTIONS
VISUAL
REASON FOR QUESTION
Low coolant levels may cause
overheating.
;T OPTIONS
FEEL FOR COOLANT IN UPPER
RADIATOR HOSE WHEN ENGINE IS
HOT, OR REMOVE THERMOSTAT,
EXPOSE f-f- TO 190°F (66’ C)
TEMPERATURES.
SEE IF IT OPENS.
REASON FOR QUESTION
An improperly functioning thermostat
can cause operating temperatures
that are either too hot or too cold.
