Your local auto parts store can help you.
Pressure test the cooling system Monitor antifreeze level
Find source and fix it.
You may have blown a head gasket, check you oil to see if the antifreeze is leaking into there.
Find the source and repair it.
Find where it is running out and repair the cause.
You can find antifreeze at most large department stores in the automotive section or at an automotive store.
If your antifreeze got hat enough to boil, you need to find out why then replace it. It will not do the job it is supposed to.
It seems so. You can find more detail in the Wikipedia article on "Antifreeze protein".
OK, find the leak and repair it.
Find the overall balance of antifreeze: amount of antifreeze to start with + the amount of pure antifreeze to add = amount of antifreeze in the final solution Let X be the amount of pure antifreeze to add in gallons. (70 * 0.25) + X = 0.80 * (70+X) 17.5 + X = 56 + 0.8X 0.2X = 56 - 17.5 0.2X = 38.5 X = 38.5/0.2 = 192.5 gallons
there is an antifreeze overflow tank, look on the radiator next to the radiator cap and there should be a smallish hose, follow it and you will find the tank.
Find where the leak is and replace the hoses or gaskets which are the culpret.