Liebe Elchgemeinde Have a little Christmas puzzle here: My V70II D5 Bj 04 got the 160 ́ wellness pack about 3 months ago. (dental belt plus water pump) Since then all 3- 4000 km the message comes little cooling liquid etc. If I then carefully turn the cover of the balance tank then hiss air, the cooling water level rises and everything is fine again. I had the same game now 4 times and always is good after venting again without something to fill up?! always builds up an overpressure… Does anyone know it? Thank you for every explanation!