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NG900/OG9-3 � COOLANT FLUSH PROCEDURE
By Rob Mustard (aka REM in Seattle)
Search word: rem_mod
Last updated � June 16, 2008
The cooling system holds 8.5 liters or 8.98 quarts. Therefore, you need 4.5 quarts of un-diluted coolant and 4.5 quarts of distilled water to completely fill the system with a 50/50 mix of coolant and water.
Here is what I do.
1) Drain the cooling system by removing the lower radiator hose.
2) Refill the cooling system with straight distilled water.
3) Run the engine (adding distilled water as needed to fill the reservoir) until the engine reaches normal operating temperature.
4) Let the engine cool and drain the cooling system again.
5) Refill the cooling system with straight distilled water.
6) Run the engine (adding distilled water as needed to fill the reservoir) until the engine reaches normal operating temperature.
7) Let the engine cool and drain the cooling system again.
8) Add 4.5 to 5 quarts of un-diluted coolant and then add distilled water until full; run the engine until the engine reaches normal operating temperature (adding distilled water as needed to fill the reservoir).
The system is self-purging so any entrained air will be expelled through the coolant reservoir.
Doing it this way requires about 4 gallons of distilled water and 2 one-gallon containers of new coolant. You will end up with about 3.5 quarts of coolant left over.
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To clean the scum out of the coolant tank:
1) Removed the coolant tank.
2) Add some rice, water, and a couple drops of dish detergent.
3) Shake well to agitate and let the rice scour the inside of the coolant tank.
4) Rinse well, and re-install the coolant tank.
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