Why should you only remove your radiator cap when the system is cool?
Coolant can only be added when the system is cooled off.
The cap will only come off when the system is cool and trying to pry it loose may break the cap and cause injury.
Adding coolant while the system is hot may cause the fluid to evaporate and therefore cause the engine to overheat.
The radiator system is under pressure and you can get burned.
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