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Assuming your question is serious, heat itself doesn't make a car go, it's a "waste byproduct". Gasoline/air mix gets ignited by a spark and rapidly burns (explodes), which causes the gas/air mixture to expand rapidly and push the pistons down. So in a way heat DOES make a car go because it's the heat of the explosion that causes the gas to expand and push the piston. Some of the heat beyond that to push the piston is desired...it warms up the engine parts so they fit tighter together and warms the oil so it flows more easily through the engine. It helps condensation inside the engine get evaporated away. Heat in the exhaust heats up the catalytic converter and makes it more efficient. So some degree (sorry, couldn't resist the pun) of the heat by-product is desired, but not all of it. Most engines are designed to operate around 180 - 240 degrees F. Older engines used to be setup at the lower range, modern engines seem to be designed to run a bit hotter in order to make all the abovementioned stuff happen. So engines have coolant and a radiator to get rid of excess heat that develops. Some engines are air cooled, in which case fins on the outside of the engine help dissipate the heat. (Old VW bugs were air cooled, as are many motorcycle engines.) In the 1st energy crisis we were all encouraged to turn down heating in our houses to save fuel. I remember someone talking about turning down the heater in their cars too! That wouldn't help save fuel...the heater inside the car also helps get rid of 'waste' heat, and to some small degree helps take some of the heat-shedding load from the radiator. What would happen if a water cooled engine lost its water? Well, this happened to my son when he had an old car and didn't know much about them: Eventually the engine got so hot the tops of the pistons melted!

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16y ago

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