You can just use antifreeze for cars (Ethylene Glycol), the only thing you cannot use is food grade antifreeze (Propylene Glycol) because it oxidizes very easily and can corrode your cooling system to ****.

So if you go to your local autoparts store and buy a premixed bottle of Prestone (Can be mixed with ANY other coolant), you are fine.

 

@antatious i have same issue, did you install thermostat and working will, or what did you do about solution ?

 

This is a 9 year old thread. You will get better results if you start a new one.