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It should never be at the full line when cold. It is an expansion tank for when it gets hot and if full when cold there is no place for it to expand to.
The coolant is a mix of water and antifreeze. The water will slowly evaporate over time and needs to be replaced periodically. If you can not see or smell it then you have no issue. Just replace the water (distilled) and carry on.
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Racecar spelled backwards is Racecar, because Racecar.
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