2.
Fill system with proper antifreeze solution. See table 3-1 for preparation of antifreeze solutions.
3.
Secure filler cap (1) to surge tank (2).
4.
Run engine at fast idle (approximately 1,500 rpm) until engine temperature reaches 190°F (88°C),
opening thermostat to circulate coolant.
5.
Depressurize system (see task a.).
6.
Fill with proper antifreeze solution until surge tank (2) is 3/4 full. See table 3-1 for preparation of
antifreeze solutions.
7.
Secure filler cap (1) to surge tank (2).
8.
Run engine at fast idle (approximately 1,500 rpm) until temperature reaches 190°F (88°C), opening
thermostat, and stop engine.
9.
Depressurize system (see task a.). Use tester to ensure proper coolant protection is provided.
10.
Secure filler cap (1) to surge tank (2).
3-61. COOLING SYSTEM SERVICING (Cont'd)
TM 9-2320-387-24-1
Change 1
3-111
FOLLOW-ON TASKS: • Start engine (TM 9-2320-387-10) and check cooling system for leaks.
• Lower and secure hood (TM 9-2320-387-10).
ETHYLENE-GLYCOL INHIBITED MIL-A-46153
LOWEST EXPECTED
AMBIENT
TEMPERATURE
PINTS PER GALLON
OF COOLANT
CAPACITY
ARCTIC GRADE ANTIFREEZE
-90°F (-68°C)
MIL-A-11755
CAUTION
Freezing point of -90°F (-68°C).
Issued ready for use and must
not be mixed with any other
liquid.
°F °C
+20
-7
1-1/2
(.71 L)
+10
-12
2
(.95 L)
0
-18
2-3/4
(1.3 L)
-10
-23
3-1/4
(1.5 L)
-20
-29
3-1/2
(1.7 L)
-30
-34
4
(1.9 L)
-40
-40
4-1/4
(2.0 L)
-50
-46
4-1/2
(2.1 L)
-55
-48
4-3/4
(2.2 L)
Below -60
Below -51.1
Use arctic grade
antifreeze -90°F (-68°C)
Table 3-1. Guide for Preparation of Antifreeze Solutions.
4
3
1
2
