 Is there other stuff that causes it? Could it be a side effect of a different problem? I mean, it could be. I mean, we always want to make sure we maintain the level of coolant in that system. And you can do that by just popping the hood and looking at the overflow bottle. Most of them are white, and they'll say full or low. You never want to open that system up when it's hot, though, because it will scald you. Mm-hmm.