TM 9-2320-387-24-l
ENGINE COOLING
DIAGNOSTIC FLOWCHART
-
ENGINE FAN NOT
WORKING PROPERLY
T OPTlONS
LOOK FOR CRACKED OR
BROKEN BLADES.
INSPECT THE COOLING FAN.
ARE THE FAN BLADES ALL
INTACT?
I POSSIBLE PROBLEMS
REASON FOR QUESTION
A damaged fan doas not cool
efficiently and could be dangerous to
FAN OR SERPENTlNE
BEL-
WIRING
FAN TIMER
FAN SOLENOID
FAN TEMPERATURE
SWITCH
PCB
r
t
A2 ]
ITI
I
KNOWN INFO
T OPTIONS
IS THE SERPENTINE BELT IN
GOOD CONDITION?
FAN OK
VISUAL INSPECTION OF
BELT TENSIONER
POSITION.
1 POSSIBLE PROBLEMS
1
REASON FOR QUESTION
SERPENTINE
BELT
FAN WIRING
FAN TIMER
FAN SOLENOld
FAN TEMPERATURE
SWlTCH
PCB
lf belt tensioner has fully
retracted, belt is to be replaced
ttxause it will not drive the fan
PwedY.
T OPTIONS
TRY rr.
KNOWN INFO
L
FAN OK
SERPENTINE
BELT OK
WITH THE VEHICLE OFF,
TRY TO TURN THE FAN
BY HAND. ARE YOU UNABLE
TO TURN IT?
REASON FOR QUESTION
fou should not be able to turn the
hn by hand. If you can, the fan
POSSIBLE PROBLEMS
FAN DRIVE
FAN WIRING
FAN TIMING
FAN SOLENOID
FAN TEMPERATURE
SWITCH
PCB
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