probably so, weather changes and that sort of stuff will cause water to over flow, My advise is to not add more water, cause that little bit you add will leak back out.
When you look into the reseviour you can see the location where extra liquid is directed to the over flow tube. Its alittle different from your average radiator cap where the pressure has to lift the spring sealed rubber seal to flow into the over flow tank. Ours is simply once the level rises to a certain height, itll spill out to the floor outside via the overflow tube.
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