Thanks for the information. It is 5:30 am. I can not sleep thinking about it! A few more question please.
Is there any reason that a cooling system will not be able to eliminate all the air?
If there is a head gasket problem, can air be being introduced into the system as it trying to be bled?
I researched a "ticking" sound coming from the top,front of the engine. Most popular explanation is a loose spark plug followed by lifter, loose belt, lose pulley and water pump going bad.
If it were the valves, common opinion (internet) says that it is not a problem and some suggest a 5W50 oil to cure the noise.
The spark plug is easy to check.
How much slack should be in the belt? Isn't there just one adjustment position?
I have always thought that the exhaust contained my vapor than I liked but it has been doing that for a long, long time.
It was cool and we had some rain and mist conditions yesterday but the BMW did it much more than my truck.
Wouldn't I need to loose considerable coolant to make the car overheat? Assuming I have the air out of the system.
Why can the engine run for more than an hour at idle (as I tried to bleed it) with the temp gauged pinned at the 1/2 mark but run a little hotter when on the road (and eventually overheat)?
I would think that the engine would cool better while while being driven gently. (more air flow and coolant flow) Is that situation an indicator of a bad water pump?
The pump can not keep up? Will a bad (weak) water pump make it harder to bleed the system also?
I will report back. Thanks again