Heat causes that. It's ok for water to bubble into your coolant bottle. That is why it is there. As water heats up, it expands. When it cools, it shrinks and sucks coolant back into your engine. You might want to flush your cooling system just to make sure everything is flowing correctly.
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Heat causes that. It's ok for water to bubble into your coolant bottle. That is why it is there. As water heats up, it expands. When it cools, it shrinks and sucks coolant back into your engine. You might want to flush your cooling system just to make sure everything is flowing correctly.