Kia Cee'd: Engine coolant / Checking the coolant level Kia Cee'd: Engine coolant / Checking the coolant level. Kia Cee'd Owners Manual / Maintenance / Engine coolant / Checking the coolant level. WARNING Removing radiator cap. Never attempt to remove the radiator cap while the engine is operating or hot. Doing so might lead to cooling system and engine damage and could result in serious personal Kia Cee'd - Coolant Repair procedures - Cooling System Kia Cee'd: Cooling System / Coolant Repair procedures. Kia Cee'd Service Manual / Engine Mechanical System / Cooling System / Coolant Repair procedures. Replacement And Air Bleeding : Never remove the radiator cap when the engine is hot. Serious scalding could be caused by hot fluid under high pressure escaping from the radiator.