Picked up the car today. Cross fingers that they have fixed the problem. It turned out that it was just an air pocket in the cooler system. Just an air pocket? That makes me wonder how many crap mechanics are out there. I have been having this problem for a longer period of time and i just had given up on it ever being fixed. I got told by the mechanics that it could be the thermostat, the fan, the top gasket and so on, but that all that seemed to be fine so they did not know anymore. One mechanic wanted to pour in welding fluid in the cooler system in case there was a crack somewhere and air was leaking in. I myself not knowing much about cars was would still think that you look for the simplest things first before you strip the whole car down but i was preparing for the worse so i am very pleased that so far the car works ok and it seems like the problem is fixed. If it would have been the top gasket the pleasure of fixing it would cost €2000 and to be honest i rather spend that on a trip somewhere then to change a piece of rubber...