2014 Chevrolet Corvette Owner Manual - Page 248

10-24 Vehicle Care If coolant is needed, add the proper DEX-COOL coolant mixture directly to the surge tank, but be sure the cooling system is cool before this is done. 1. When the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot, remove the pressure cap. Turn the pressure cap slowly counterclockwise about one-quarter turn and then stop. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left. 2. Keep turning the pressure cap slowly, and remove it. 3. Fill the coolant surge tank with the proper DEX-COOL coolant mixture until the level inside stabilizes at the cold fill line on the front of the surge tank. 4. With the coolant surge tank pressure cap off, start the engine and let it run until the upper radiator hose can be felt getting hot. Any time during this procedure, watch out for the engine cooling fan. By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level stabilizes at the cold fill line on the coolant surge tank. 5. Replace the pressure cap tightly. Check the level in the surge tank when the system has cooled down. If the coolant is not at the proper level, repeat Steps 1−4, then reinstall the pressure cap. If the coolant is not at the proper level when the system cools down again, see the dealer. How to Add Coolant to the Coolant Surge Tank { Warning You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. { Warning Steam and scalding liquids from a hot cooling system can blow out and burn you badly. Never turn the cap when the cooling system, including the surge tank pressure cap, is hot. Wait for the cooling system and surge tank pressure cap to cool.