Engine Compression & Cooling System Tools

What is the function of the spring-loaded pressure valve inside an automotive Radiator Cap (e.g. 16 PSI)?

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 Correct IncorrectPressurizing the cooling system raises the boiling point of 50/50 water-antifreeze, raising boiling point from 225°F to over 265°F to prevent engine boil-over.

What is the function of the spring-loaded pressure valve inside an automotive Radiator Cap (e.g. 16 PSI)?

• It lets hot air escape into the cabin
• It measures radiator water volume
• It stops coolant from entering the water pump
• It pressurizes the cooling system to elevate the coolant boiling point from 225°F up to over 265°F