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Question:

What happens when you let the air out of hot tires?

A When the tires cool off, they will not have enough pressure.
Explaination

When tires get hot, the air pressure rises. However, relieving that pressure will leave the air pressure too low later, and the tires may then catch fire or blow out. It will also not have a cooling effect. If your tires are too hot to touch, stop until they have cooled down.