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Overheating is when your car’s engine is running too hot. Too little antifreeze can cause this problem, particularly if the antifreeze is leaking or not circulating through the system properly because of a faulty uptake hose. If your engine is overheating, you should pull over, stop the car, and let the engine cool down. If you are not in a position to immediately stop the car, you should turn the heater on, which will temporarily cool the engine a bit until you can pull over and assess the problem.