What is the safest action to take when the car engine is hot regarding the radiator cap?

When dealing with a hot engine, the safest action regarding the radiator cap is never to remove it. The reason for this is that the engine coolant can reach extremely high temperatures and pressures, especially when the engine has been operating for a while. Removing the radiator cap while the engine is hot can cause hot coolant and steam to erupt, leading to serious burns or scalds.

This precaution is essential for your safety, as well as for preventing damage to the vehicle’s cooling system. Keeping the radiator cap secure until the engine has cooled down significantly minimizes the risk of hazardous situations. It’s vital to allow the engine to cool before attempting any maintenance related to the cooling system.