Hi All I have a 1997 E39 528i, and I am having problems with the cooling system. I;ve just changed the radiator a couple of days ago, and bled the system a couple of times. The funny thing is that, after running the car for sometime the coolant level goes down, and stays down even after the car has cooled down overnight, and the minute I open the cap, when cold, the level goes up and you can hear the pressurised air coming out. At this moment if i leave the car running it overheats. I let it cool down and bleed it again and things run fine after that. However, if I re-open the cap the second day when it is cold the same thing happens again, the coolant level rises up and it will over heats if I drive it, and will only be ok if I bleed it again. Is this normal, or do I have a blown head-gasket, or is it just a bleeding problem. There is no leak in the cooling system and the coolant is not used up.
- posted
17 years ago