TM 9-2320-280-20-2
3-60. COOLING SYSTEM SERVICING
This task covers:
a. Depressurizing
c. Preventive Cleaning
b. Draining System
d. Fillng System
INITIAL SETUP:
Tools
Manual References
General mechanic’s tool kit:
TM 9-2320-280-10
automotive (Appendix B, Item 1)
TM 9-2320-280-24P
TM 750-254
Test Equipment
TB 750-651
Radiator tester (Appendix B, Item 66)
Equipment Condition
Materials/Parts
Hood raised and secured (TM 9-2320-280-10).
Antifreeze (Appendix C, Item 12)
General Safety Instructions
Do not remove surge tank filler cap before
releasing internal pressure.
a. Depressurizing
W A R N I N G
Do not remove surge tank filler cap before depressurizing system
when engine temperature is above 190°F (88°C). Steam or hot
coolant under pressure will cause severe burns.
1. If engine is hot, remove surge tank filler cap (1) by placing a thick cloth over cap (l). Press down and
turn counterclockwise to its first stop to release internal pressure.
2. After pressure has escaped, press down and turn cap (1) counterclockwise again and remove.
b. Draining System
1. If engine is hot, repressurize system (see a. of this task).
N O T E
Have drainage container ready to catch coolant.
2. Open draincock (4) and allow system to drain.
3. Close draincock (4).
c. Preventive Cleaning
1. For preventive cleaning, refer to TB 750-651.
2. Test surge tank filler cap (1), refer to TM 750-254.
d. Filling System
N O TE
The cooling system for the vehicles covered in this manual has a
26 qt (25 l) capacity. Continue filling and allow air to escape. Ensure
surge tank coolant level is 3/4 full before securing filler cap.
1. Ensure radiator draincock (4) is closed and heater control valve (3) is open (pull “TEMP” knob on
dash to “MAX” position).
2. Fill system with proper antifreeze solution. See table 3-1 for preparation of antifreeze solutions.
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