WARNING: For reasons of safety, always follow these safety precautions. SAFETY RADIATOR COOLANT LEVEL When inspecting the radiator coolant level, stop the engine and allow the temperature and pressure to subside. Check the coolant level in the sub-tank. Under normal conditions, do not open the radiator cap. If there is no sub-tank, or if the radiator must be removed: Wait for the radiator temperature to go down before checking the coolant level. Be careful not to actually touch the radiator or engine; place a hand near the engine or radiator to check the air temperature. Release the internal pressure before loosening the radiator cap, and remove the radiator cap slowly.
When adding coolant and/or additives, add it to the sub-tank. 1-24 WA420-3MC