Quote:
Originally Posted by Tye300
I have no idea. But look closely at the reservoir, it has a small hole near the cover. I know it supposed to be a closed system, but it's there. It sure seems to be a factor why we lose coolant.

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I think the hole is there for air pressure equalization. When the coolant is drawn into the radiator as the engine cools down it prevents suction from forming in the coolant storage reservoir. You shouldn't lose fluid from this hole unless you are overfilling your reservoir.