Komatsu ecot3 GALEO HM300-2 Operation And Maintenance Manual page 219

SERVICE PROCEDURE SERVICE PROCEDURE
4. Loosen radiator cap (3) a little to release the residual pressure
and then remove it.
5. Open drain valve (4) at the bottom of the radiator and drain
valve (5) of the oil cooler and drain the coolant.
6. After draining the coolant, close drain valves (4) and (5), and fill
with city water.
7. When the radiator is full, start the engine, and run it at low
idling.
Keep the engine running at low idling for 10 minutes until the
water temperature reaches more than 90°C (194°F) (guideline:
the indicator on the engine water temperature gauge is
horizontal).
8. Stop the engine, open drain valves (4) and (5), and drain the
water. After draining the water, close them.
9. Replace the corrosion resistor, then turn valve (2) to open it.
For replacing corrosion
CORROSION RESISTOR CARTRIDGE (PAGE 4-61)".
10. Add coolant mixed with antifreeze until it overflows from the
water filler.
Decide the proportions of antifreeze and water according to the
table for the mixing rate of water and antifreeze.
11. To remove the air contained in the coolant, run the engine at low idle for 5 minutes, then run for another 5
minutes at high idle. (When doing this, leave the coolant filler cap OFF.)
12. Stop the engine. About 3 minutes later, supply the coolant up to the coolant filler, then close radiator cap.
13. Drain the coolant from inside of reservoir tank (6), flush the
inside of the reservoir tank, then fill with the coolant to a point
between the FULL and LOW marks.
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resistor, see "REPLACE
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MAINTENANCE MAINTENANCE