At operating temperature, the engine coolant is hot and the engine coolant is under pressure. The radiator and all lines to heaters or to the engine contain hot coolant or steam. Any contact can cause severe burns.
Steam can cause personal injury.
Only check that the coolant level after the engine has been stopped. Make sure that the radiator cap is cool. In order to remove the radiator cap with the bare hand, the radiator cap must be cool. In order to relieve pressure, remove the radiator cap slowly.
Cooling system conditioner contains alkali. Alkali can cause personal injury. Do not allow alkali to contact the skin, the eyes, or the mouth.
Allow cooling system components to cool before draining.
Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the skin.
Remove the cap for the makeup tank after the engine has stopped. The filler cap must be cool to the touch.
Relieve all of the pressure in any system (air systems, oil systems, fuel systems, or cooling systems) before any system components are disconnected.
Batteries give off flammable fumes which can explode.
Do not smoke when observing the battery electrolyte levels.
The liquid in a battery is an electrolyte. Electrolyte is an acid. Electrolyte can cause personal injury. Do not allow electrolyte to contact the skin or the eyes.
Always wear protective glasses when you work with batteries.