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 1148 of 1313

FIELD MAINTENANCE

COOLING FAN DOES NOT OPERATE, ENGINE TEMPERATURE ABOVE 195°F (91°C) AS INDICATED BY

TEMPERATURE GAUGE

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Test Set, Electronic Systems

(Volume 5, WP

0826, Table 1, Item 51)

Personnel Required

(2)

References

Point to Point Schematics

References (cont.)

WP

0106

WP

0131

Volume 3, WP

0447

Volume 3, WP

0448

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

COOLING FAN DOES NOT OPERATE, ENGINE TEMPERATURE ABOVE 195°F (91°C) AS INDICATED BY

TEMPERATURE GAUGE

NOTE

Conduct these malfunction tests if the cooling fan does not operate and the engine

temperature is above 195 °F (91°C). This procedure will check for air availability, faulty

temperature gauge, and faulty fan drive clutch actuator.

TM 9-2320-272-23-1

0138

0138-1