TM-9-2320-361-24-2

2-1/2 TON, 6X6, M44A2 SERIES TRUCKS

TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 2 OF 2

AUGUST 2006

TM-9-2320-361-24-2 - Page 854 of 1144

TM 9-2320-361-24-2

0426 00

0426 00-2

ENGINE COOLANT HEATER TESTING (Contd)

PREPARATION

WARNING

• Do not perform engine coolant heater testing while smoking

or within 50 feet of sparks or open flame. Fuel is flammable

and can explode easily, causing injury or death to personnel

and damage to equipment.

• Exhaust gases can kill. Do not operate personnel heater in

enclosed areas. Ensure work area is well ventilated and

exhaust fumes are directed away from test area.

NOTE

• Perform “preparation” subtask before performing any test and

perform “test equipment removal” after each test is complete.

• Heater must be tested in same position as mounted on

vehicle.

• Use proper coolant required for engines which are being

heated.

Water cannot be used because the overheat switch and

restriction thermostat are set for temperatures above the

boiling point of water.

• Coolant container must be vented and raised above the test

apparatus in order for thermosyphon circulation to occur.

• Fuel pump, fuel filter, heater, wiring harness, fuel tubing,

control box, and coolant must be the same type used on

vehicle.

1.

Connect coolant heater (N) to test equipment using schematic on facing page.