Why is it important to not remove the radiator cap when hot?

Removing the radiator cap when hot is crucial because the cooling system is pressurized, and doing so can result in hot coolant spraying out. This can cause serious burns or injuries to anyone nearby, as the coolant can reach boiling temperatures. The pressure builds up due to the heat, and when the cap is removed, this pressure is released suddenly, potentially leading to a dangerous and explosive release of steam and liquid. Safety is a top priority in vehicle maintenance, and handling a hot radiator improperly can lead to significant harm. It's essential to wait for the engine to cool down before checking the coolant level or opening the radiator cap to ensure safe handling and prevent accidents.