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When you put water in the radiator and you leave the cap off while the car is running and the water comes back out while the car is running why does that happen?
Wiki User
∙ 12y ago
Simply stated: The coolant system of your car is a pressurized system. When your engine is running it is generating heat causing the coolant to expand. Your radiator cap helps maintain the pressure in your coolant system, without it there the water as it heats will push it's way back out of the system. Even when you have the cap on the pressure will push coolant into the reservoir that is attached to the tube you can find coming out past the cap. When your engine cools the extra coolant is pulled back out of the reservoir into the cooling system. NOTE: You should always use the recommended coolant specified by your car manufacturer, using only water can possibly damage your engine.
Wiki User
∙ 12y ago
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