Hello Motor-Talkers I have in my car a cooling water tank that has become seemingly opaque over time. Similar to the container in the picture. (The picture is from another website, but looks exactly the same, also the shape) If I fill in water/forest protection now until I see the water level through the opening, I am already above the “Full Cold”. (Through the special shape of the container.) Is there a kind of overpressure valve in the cooling system? Which seals destroy permanently… Greetings Domi