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It depends.

 

If topping off the coolant use the appropriate mix of distilled water and anti-freeze.

 

When changing the coolant, after flushing the system with distilled water, empty out as much of the water as possible, close the drain, then add anti-freeze to make the desired mixture based on the system capacity, then top off with distilled water. For example, if your system capacity is 4 gallons you would add 2 gallons of anti-freeze and then top off with distilled water to make a 50:50 mix. Sometimes removing the lower radiator hose is necessary to get enough water out after flushing to add the necessary amount of anti-freeze.

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