- I have a Is 2007 Hyundai sonata and I've been using water in the cooling system. Now I wanna use coolant. Since there is water already in the radiator, how much coolant do I have to mix to use it?
You need to evacuate all water from the system. Open your heater to full. Remove the thermostat and the bottom radiator hose and blow compressed air into the thermostat fitting seat to get all the fluid out. Put it back together and refill with 50/50 premix coolant and burp the system of air.
Hi! It's a great idea to switch to coolant. If you can use a radiator flush to clean the cooling system first would be great too, since water is good for cooling but doesn't have anti corrosion and stuff.
A 50/50 distilled water and coolant would suffice, but in colder weathers, up to 70/30 coolant and distilled water is needed. Not more than 70% too though. Use the specific type of coolant, OEMs are the best but you can go for aftermarket as long as they're the same type and color too! Never mix other types of coolants. Always flush if you're planning to change.
