Hello is a Crafter 2.0 with 120kw Year of construction 2012 – 195.000km The first time I noticed problems when the water lack warning light approached, unfortunately I did not have a temperature indicator and therefore did not know the temperature – behavior occurred without trailer after highway ride. It turned out that the water pump is leaking, we changed the incl. the timing belt also the lid of the compensation tank was defective was also replaced. n but now again hot – only after 50-100km and uphill stretches – the balance tank has air bubbles, the temperature indicates when driving over 100 degrees (have APP with ODBII plug installed). I then open the container and the water shoots out, if I do not stop the water also comes out alone and the water deficiency indicator lights up – it happens to me that a lot of air is present in the system because the water runs after the balance tank and it bubberts relatively strongly – if m on the road (with trailer) then the temperature stays in the normal range (under 90 degrees) even after 50km! Is this the cylinder head seal or does anyone still have an opinion? thank you wolfgang