TM 5-2420-224-20-2
COOLING SYSTEM SERVICE (CONT)
2.
3.
4.
5.
6.
Remove cap (3) from expansion tank (4).
NOTE
Provide 6-gallon (23-liter) container
to catch draining coolant.
Open draincock (5) at bottom of radiator and
drain coolant.
Close draincock (5).
Remove plug (6) and seal ring (7) and drain
engine block (8). Discard seal ring.
Install new seal ring (7) and plug (6).
F I L L I N G
1.
Make sure radiator draincomk is closed and
knob on heater is turned halfway out.
2.
Add coolant. Bring coolant level to within 1 in.
(30 mm) of top edge of filler tube opening.
Replace cap and tighten.
3. Start and run engine for at least 5 minutes to
eliminate any air pockets. Recheck coolant
level; add coolant if necessary.
NOTE
Follow-on Maintenance:
Install inside engine hood
4-389).
C O L D W E A T H E R S E R V I CE
(page
For operation in temperatures below
recommended
a m o u n t o f
freezing, use
antifreeze
(LO 5-2420-224-12) in cooling system (TM 9-207).
When proper coolant mixture is determined, fill
cooling system as follows:
1.
Drain coolant (Draining, above).
2.
Flush cooling system with fresh water; close
radiator draincock. Make sure all hose
connections are tight.
3.
If water and antifreeze are added separately,
pour antifreeze into radiator first, then add clean
water until water level is approximately 1 in. (30
mm) below top edge of filler tube opening.
4.
Start and run engine at idle for 5 minutes to
thoroughly mix water and antifreeze. Recheck
coolant level; fill as necessary.
NOTE
Follow-on Maintenance:
Install inside engine hood (page
4-389).
4-88
