TM-9-2320-273-10
TRUCK, TRACTOR, LINE HAUL; LIGHT EQUIPMENT TRANSPORTER; TRUCK CHASSIS; MEDIUM EQUIPMENT TRANSPORTER
TECHNICAL MANUAL; OPERATOR’S MANUAL
DECEMBER 2012
TM-9-2320-273-10 - Page 368 of 452
DRAINING COOLING SYSTEM
WARNING
Let radiator cool before removing cap. Remove radiator cap
in two steps. First, place a thick cloth over the cap and
slowly rotate cap left to its first stop, pause, and let pressure
escape from cooling system. Then rotate cap further left until
you can remove it. Failure to comply may result in serious
burns. Seek medical attention in the event of an injury.
Leaking or spilled coolant may cause a slip and fall hazard.
When draining cooling system, clean any leaking or spilled
coolant immediately using suitable absorbent materials.
Dispose of contaminated cloths, rags, or cleaning materials
in accordance with local procedures and plans. Failure to
comply may result in injury to personnel. Seek medical
attention in the event of an injury.
1. Remove radiator cap (Figure 1, Item 1) from radiator filler neck
(Figure 1, Item 2).
NOTE
Use a suitable drain pan to capture coolant when draining
cooling system.
The radiator has one drain cock located on the left side of
the radiator bottom tank, facing the engine.
Coolant is drained from the engine cylinder block by
removing the temperature sending unit form the cylinder
block. The temperature sending unit is located on the right
side of the cylinder block near the back of engine.
A drain cock is located on the top of the thermostat
manifold and on front of oil cooler. These drain cocks are
used to drain coolant or allow air to escape the cooling
system when filling or adding coolant.
2. Position drain pan under radiator drain cock (Figure 2, Item 5). Open radiator
drain cock (Figure 2, Item 5) and allow coolant to drain.
3. Position drain pan under oil cooler drain cock (Figure 2, Item 2). Open thermostat
manifold drain cock (Figure 2, Item 3) and oil cooler drain cock
(Figure 2, Item 2) and allow coolant to drain.
4. Disconnect electrical connector from temperature sending unit (Figure 2, Item 1).
5. Position drain pan under right side of cylinder block (Figure 2, Item 4). Remove
temperature sending unit (Figure 2, Item 1) from cylinder block (Figure 2, Item 4)
and allow all coolant to drain.
TM 9-2320-273-10
0029
0029-2
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