open coolant reservoir when hot?

How long to wait to open car radiator coolant level when its hot

It is best not to open the radiator cap until it is cool. An overheated engine may have a coolant that is as hot as 260 degrees Fahrenheit. A seal is placed around the system. As soon as it is exposed to air, it will boil and cause severe burns.

How to open under pressure hot radiator cap

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