0053
TM 1-1740-221-13&P&P
COOLING SYSTEM SERVICE - (CONTINUED)
DRAIN RADIATOR/ENGINE COOLANT
1
2
4
3
WP0045F2
Figure 2. Cooling System Service
WARNING
To avoid personal injury, do not remove the radiator cap when the engine is hot. Let the engine
cool down and then loosen the cap slightly to relieve any excess pressure before removing
cap completely.
The use of Personal Protective Equipment (PPE) is required when using or handling hazardous
materials associated with operating and maintaining equipment (jet fuel, hydraulic luid, brake
luid, ethylene glycol, cleaning solvents, compressed air, and engine/axle oil). Failure to use
PPE when handling these materials could result in injury or death.
1.
Open engine cover (WP 0028).
2.
Remove radiator cap (Figure 2, Item 1).
3.
Place a drip pan under the radiator.
4.
Open radiator drain petcock (Figure 2, Item 4). Drain radiator coolant completely.
5.
Place a drip pan under the engine drain plug.
6.
Remove engine drain plug (Figure 2, Item 3). Drain engine coolant completely.
7.
Loosen hose clamp securing red heater hose to water pump outlet adapter, then disconnect hose and drain
completely.
8.
Loosen hose clamp securing black heater hose to thermostat and disconnect hose and drain completely.
9.
Install red heater hose to water pump outlet adapter and secure with hose clamp.
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