Do you leave car running when flushing your radiator?

No, you should never leave your car running when flushing your radiator. The engine needs to be off to safely and effectively flush the cooling system. Running the engine while flushing could lead to:

* Scalding hot coolant spraying out: This poses a serious burn risk.

* Damage to the water pump: The pump might be damaged by the flushing solution.

* Air getting into the system: This makes it harder to properly flush the system and can lead to overheating.

Always follow the instructions provided by your vehicle's manufacturer or the specific radiator flush product you are using. These instructions will always specify turning the engine off.