HYa, I already wrote that I had to change the cooler ad hoc to come back home. The cooler was installed with connection for the cooling of the automatic transmission oil, but the FZ is a switch. Can that be that the cooler has a significantly higher cooling capacity? What I now notice is: 1.) I still have a slight loss of coolant (if it is one) and had to refill about half a liter yesterday. were there still air bubbles somewhere in the circulation? At the MV6 one should, as I read afterwards in the WS-Handbuch, refill the main part of the cooling liquid not via the balance tank but via the supply line to the heating heat exchanger (head scrap). What about it? Can this still be air in there? Until when (in kilometers) the air should be out there? Then I have to look for another leak. (A water flag I fortunately do not follow) 2.) My heating won’t get really warm if I don’t give gas. According to the thermometer, the cooling liquid has around 90 – 92 degrees. It won’t get any more. Nevertheless, in the morning, on my way to work, I only have lukewarm air out of the heating. In the evening, when I mostly ride uphill and sometimes turn over 3000 tours, it’s getting much warmer. That wasn’t like that before the cooler change, so it got nice and warm in the morning. THX Mathias?