Check your concentration with one of those $3 testers. Hydrometer is the fancy name. Peak and Prestone come to mind. Small plastic thing, fits in the palm of your hand. Its got a small "turkey baster" bulb on top. Just suck up some coolant out of your rad and it will float a needle to show your freeze/boil points. If its too weak, drain some and add some full strength til you get what you need. Nothing wrong with filling your overflow tank above the line either, you can go a couple inches from the top, it'll get sucked in sooner or later....E
