TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 1150 of 1313
COOLING FAN DOES NOT OPERATE, ENGINE TEMPERATURE ABOVE 195°F (91°C) AS INDICATED BY
TEMPERATURE GAUGE - Continued
T0330DAA
COOLING
FAN
ENGINE
FAN DRIVE
CLUTCH
ACTUATOR
Figure 2.
Fan Clutch Actuator.
b.
Replace fan drive clutch actuator with a known good actuator M939/A1 (Volume 3, WP
0447),
M939A2 (Volume 3, WP
0448).
c.
Start engine and bring to normal operating temperature.
NOTE
If cooling fan operates, fan drive clutch actuator was faulty.
d.
Check if cooling fan operates.
e.
Shut off and allow engine to cool.
f.
If cooling fan does not operate, replace fan drive clutch actuator with original actuator.
CONDITION/INDICATION
IS FAN DRIVE CLUTCH ACTUATOR FAULTY?
DECISION
YES - Go to Step (3) to verify problem is solved.
NO - Perform Temperature Gauge Inoperative (Coolant) troubleshooting (WP
0106).
TM 9-2320-272-23-1
0138
0138-3
Back to Top
