Civic Si L4-2.0L (2004)
8. Pour Honda All Season Antifreeze/Coolant Type 2 into the radiator up to the base of the filler neck.
NOTE:
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Always use Honda All Season Antifreeze/Coolant Type 2 (P/N OL999-9001). Using a non-Honda coolant can result in corrosion, causing the
cooling system to malfunction or fail.
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Honda All Season Antifreeze/Coolant Type 2 is a mixture of 50% antifreeze and 50% water. Premixing is not required.
Engine Coolant Refill Capacity [including the reserve tank capacity of 0.53 L (0.56 US qt.)]: 5.0 L (5.3 US qt.)
9. Install the radiator cap loosely.
10. Start the engine, and let it run until it warms up (the radiator fan comes on at least twice).
11. Turn off the engine. Check the level in the radiator, and add Honda All Season Antifreeze/Coolant Type 2 if needed.
12. Put the radiator cap on tightly, then run the engine again and check for leaks.
13. Install the splash shield.