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Well if by hot you mean the engine overheats the answer is simple. While driving in town ( city driving ) you engine is not pushed as hard as on the highway. On the highway the engine is getting a constant flow of gas with no break where as in the city you drive to a certain speed letting of the gas when the speed is reached, slow down, or stop. The engine is also going at around 5000 rpms depending on your vehicle then the rpms go down when it shifts but if you slow up it goes back up to the high rpm's.

While there's probably nothing technically wrong with the above answer, it also doesn't help with your overheating problem.

If the engine gets hot at highway speeds and cools off when you slow down, there is likely a restriction in the cooling system. Could be a bad thermostat, plugged radiator, or perhaps plugged water passages in the block or heads. Start with the thermostat since it's the cheapest and easiest thing to try. Sometimes a radiator can be flushed, but usually you end up buying a new one. If the block is plugged up, it is probably a very old, poorly maintained engine and will need to be disassembled and cleaned.

If this is a new combination and has never cooled properly, perhaps you just need a bigger radiator.

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Q: Why would a car get hot on highway an not in town?
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