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 1149 of 1313
COOLING FAN DOES NOT OPERATE, ENGINE TEMPERATURE ABOVE 195°F (91°C) AS INDICATED BY
TEMPERATURE GAUGE - Continued
STEP
1.
IS AIR AVAILABLE TO RUN THE COOLING FAN?
a.
Start engine.
b.
Monitor secondary air pressure gauge on instrument panel. Refer to point to point schematics.
T0328DAA
SECONDARY
AIR
PRESSURE
GAGE
INSTRUMENT
PANEL
Figure 1.
Secondary Air Pressure Gauge.
CONDITION/INDICATION
IS AIR AVAILABLE TO RUN THE COOLING FAN?
DECISION
YES - Go to Step (2).
NO - Perform Secondary Pressure Gauge Reads No Pressure, Low Pressure, Or Builds Too Slowly
troubleshooting (WP
0131).
STEP
2.
IS FAN DRIVE CLUTCH ACTUATOR FAULTY?
a.
Shut off and allow engine to cool. Refer to point to point schematics.
TM 9-2320-272-23-1
0138
0138-2
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