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By the time the coolant has completely run out, the engine will have overheated enough to do serious damage. The heads will be warped and the engine may sieze. If the temperature light comes on, let the engine cool down before you do anything. If it is leaking badly, like a burst radiator hose, have it towed in. If it seems to be leaking slowly, you may be able to add water to drive it to the shop, but if it's winter, that's not a good idea.

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Q: What happens if the coolant runs out in a car?
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