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Ask The Mechanic
Tue Dec 4, 2012 12:54 PM CST

After reading last month’s article that included the “Safety Tip of the Month” about not opening the radiator cap on an engine until it cools, I have a question. Why is it that when an engine is overheating but not spewing out the radiator cap, and the radiator cap is opened, hot water and steam blow out the radiator? This is what makes opening a radiator with hot coolant in it so dangerous. I opened a seemingly “harmless” radiator cap once and got burned instantly by the steam and coolant when it ...

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