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Originally Posted by beemarman
it really puzzling, the car does not overheat even after running for nearly 1hr. I spoke to BMW technican and he said that they could be a air lock in the system and to try and get rid of the air by unscrewing the little nob next to the cap of the coolant bottle.
I have tried this and notice a lot of bubble and air coming out - the problem i have now is how do i know when the air lock has cleared?
The pressure still builds up when the car is running but it's not as bad as before. I just need to know when the air lock has cleared.  |
You unscrew the bleed screw until all the bubbles run out and solid coolant is coming out. Then you shut it (dont overdo it--its only plastic). Also make sure that you have your heater turned all the way hot and that it blows full power as you bleed it.