hej my t5, head seal new, head with the motor repairer pressed off, valve seats etc. made everything clean. new water pump, timing belt pipapo – runs like a new one. so far also great performance, no problems. I chased him up the mountain twice for the test. all good. only – I open the balance tank it cooks massively over – after forced drive. hoses are however never extremely hard. fan starts to run briefly. I don’t know how to open the lid – but I don’t have to check if everything is ok. why does it boil so massively over? the water really gets extremely hot at the turbo? doesn’t know that from tdi, since it makes even at 30 degrees and full gas only briefly hissic. fan is also not going on (beim tdi 50% fan at 94 degrees). thermostat and temperature sensor is new&original. display in the combi instrument is always 3h – white – what is the degree of faith?