What's that sound on cars on a hot day?

  • Thread starter flyingpig
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Like on a hot day, cars make these clicking sounds on the surface? Does having a silver or white-colored car make it worst? Because I've seen black -colored ones do that too
 

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  • #2
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Like on a hot day, cars make these clicking sounds on the surface? Does having a silver or white-colored car make it worst? Because I've seen black -colored ones do that too
Without actually hearing the same sounds that you hear, it is hard to say what they might be. I believe that a likely explanation is simply the expansion of sheet metal exposed to heat. There is always a certain amount of "looseness" where such parts join, and also a certain amount of friction that opposes free expansion. When the expansive forces overcome the frictional forces, the adjustment is abrupt--producing a "clicking" sound. Metal roofs on structures do exactly the same thing.
 
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Let's just say the clicking sounds has a high frequency
 

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