TM 9-2320-280-20-2
3-60. COOLING SYSTEM SERVICING (Cont’d)
3.
4.
5.
6.
7.
8.
9.
10.
Secure filler cap (1) to surge tank (2).
Run engine at fast idle (approximately 1500 rpm) until engine temperature reaches 190°F (88°C),
opening thermostat to circulate coolant.
Depressurize system (see a. of this task).
Fill with proper antifreeze solution until surge tank (2) is 3/4 full. See table 3-1 for preparation of
antifreeze solutions.
Secure filler cap (1) to surge tank (2).
Run engine at fast idle (approximately 1500 rpm) until temperature reaches 190°F (88°C), opening
thermostat, and stop engine.
Depressurize system (see task a. of this paragraph). Use tester to ensure proper coolant protection
is provided.
Secure filler cap (1) to surge tank (2).
Table 3-1. Guide for Preparation of Antifreeze Solutions.
ETHYLENE-GLYCOL INHIBITED MIL-A-46153
LOWEST EXPECTED
AMBIENT
PINTS PER GAUON
ARCTIC GRADE ANTIFREEZE
TEMPERATURE
OF COOLANT
-90°F (-67.7°C)
CAPACITY
MlL-A-11755
°F
°C
+20
-6.7
1-1/2
+10
-12.2
2
CAUTION
0
-17.7
2-3/4
-10
-23.3
3-1/4
Freezing point of -90°F (-67.7°C).
-20
-28.8
3-1/2
Issued ready for use and must
-30
-34.4
4
not be mixed with any other
liquid.
-40
-40.0
4-1/4
-50
-45.5
4-1/2
-55
-48.3
4-3/4
Below -60
Below -51.1
Use arctic grade
antifreeze -90°F (-67.7°C)
FOLLOW-ON TASKS:
Start engine (TM 9-2320-280-10) and check cooling system for leaks.
Lower and secure hood (TM 9-2320-280-10).
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