Hallöchen, a good friend of mine drives an Audi 80 B4 convertible with the 2,6l V6. Yesterday he lost cooling water, nothing serious, he noticed it in time before there was too little water in it. Overheating is therefore not a topic. Then he found the cause immediately. The hose on the driver’s side which goes to the heat exchanger in the interior has a crack. During the expansion we noticed that if you steer to the left this hose is clamped between steering rods and cooling water pipe. Even when driving straight out the hose is still deformed. Only if you hit the right side, there is no contact between steering rods and heating hose. It seems strange to me that this hose has been broken by the continuous walking movements of the hose. The engine has been changed by the previous owner times, I guess now that he has misplaced the hose and therefore the defect has occurred. Hope that a few Audi specialists are able to help us further by telling us how the hose has to run properly.