ARMY TM 9-6115-670-14&P
3-20
3.8. RADIATOR.
This task covers:
Service
INITIAL SETUP
Tools
None
Equipment Conditions
Engine stopped and allowed to cool completely.
Materials/Parts
Coolant (see Table 3-2)
MASTER ON-OFF switch on APU controller set
to OFF.
SERVICE
a. Check coolant level at radiator overflow tank (1, Figure 3-4). Coolant should be halfway
between “FULL” and “LOW” marks (3).
b. If coolant level is at “LOW” mark, remove cap (2) and add coolant to halfway point between
“LOW” and “FULL” mark. Install cap (2).
c. If overflow tank is empty, add coolant to tank (step b), then remove radiator cap (para 3.7.), add
coolant slowly until full (1, Figure 3-3), and re-install radiator cap (para 3.7.).
Table 3-2. Freezing Points, Composition, and Specific Gravities
Lowest Ambient
Temperature +20°F
(-6.67°C)
Pints (liter)
Glycol/Gallon (liter)
Coolant
Compound
Antifreeze
Ethylene Coolant
Specific Gravity
@ 68°F (20°C)
+20°F (-6.67°C)
1-1/2 (0.19)
Issued at full strength and
ready mixed for 0° to -65°F
(-17.78 to 18.33°C)
temperatures for both
initial installation and
replenishment of losses.
1.022
+10°F (-12.22°C)
2 (0.25)
1.036
0°F (-17.78°C)
2-3/4 (0.34)
1.047
WARNING
Hot coolant is under pressure. DO NOT remove
radiator cap when engine is hot. Allow engine to
cool completely before removing radiator cap.
Once cooing has occurred, loosen cap slightly to
relieve any excess pressure before removing cap
completely. Failure to observe this warning could
result in injury to personnel.
