ennathnal ommgund
ennathnal ommgund voted up Dona Gilbert's answer

Although hot weather is the most common cause of overheating, many other factors can cause the same problem. If your vehicle overheats in traffic in normal weather, one of the following may be the culprit: The water and coolant level in the radiator is low. There's a leak in the cooling system.

ennathnal ommgund
ennathnal ommgund voted up Anonymous' answer

Let see...  There's this thing called friction, which you should have learned about in school.  Machines get hot due to friction.  Cars are machines. They also have internal combustion engines. Simply speaking they operate based on an ongoing series of tiny explosions and fire created by sparks and gasolines. Combustion = fire.    

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