When a car radiator overheats or breaks down, one of the first things to do is check the coolant levels inside the system. However, as the coolant is under significant heat and pressure, you can't just remove the radiator cap and take a peek inside. The radiator cap is, in fact, designed to actually keep the cooling system under pressure, and if you remove it carelessly while the engine is still hot, you face the risk of getting scalded by a steaming geyser of boiling coolant. As CarCare News Service discusses in an article: Maintaining the anti-freeze coolant is an important aspect of a healthy cooling system. This involves one of the most basic components of the automobile, the radiator pressure cap. The cap keeps cooling system pressure at the recommended pressure rating for the car. Each pound of pressure exerted on the cooling system raises the boiling point of the coolant by 3 degrees at sea level.
http://www.radiator.com/newsroom/cool-radiator-technology-the-double-safe-radiator-cap/
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