I have a 1997 E39 528i, and I am having problems with the cooling
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
There is no leak in the cooling system and the coolant is not used up.