After driving for a little while, you turn into a parking lot, park your car, turn it off and get out. Then you hear the engine making clicking sounds. It only does it when it’s hot, does it have something to do with metals expanding when they’re hot or?
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Engines also click when warming up. Not only when cooling down.
However, there is a lot of engine noise so you don’t really hear it.
It indeed is a case of thermal expansion and contraction. The same can happen with any material that changes temperature. Especially when different materials are combined.
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