What precautions are needed when checking the engine coolant?

It is best to check the coolant level when the engine is cold to avoid scalding. Always check the coolant level at the overflow tank, if present on the unit, instead of the radiator. If the engine is warm and checking is needed without an overflow tank, wear safety glasses and gloves, put a rag over the radiator cap, turn the cap slightly, and let pressure escape slowly before completely removing the cap.