Hello, I had the problem, that I lose coolant (100 ml to 1000 km). I then put the Audi to the VAG and said he should look at it. They then made a pressure test and proved sure that a cooling water hose was leaking. This was replaced. On my account I have the following positions: leak of the cooling system checked coolant hose coolant hose replaces 2 clamps coolant. I then thought it was all in butter and am At home I looked and saw that the coolant stand is at min. Since I had no G12 Plus, I drove home as planned (2nd seat), that is 200 km highway, full load of course. At home I discovered that the coolant balance tank was empty. So it was really empty. I then tipped over 1 liter G12 Plus / water mixture. So I drove back the 200 km, nothing changed at the coolant stand, so it’s all there. I also drove full load and turned it properly. Now my question: Did the workshop forget to vent the cooling system? Because there is nothing on the bill. And why did the warning light go on net?