Alright - update time.

I towed it to a local BMW repair shop and got the expansion tank replaced and themostat replaced. 422.00

I picked it up the next day.. only to make it 3 miles down the street. Got towed back.
Result - found out the water pump was bad which caused pressure build that cracked the tank. New water pump and labor- 223.00

Picked up and drive home. everything is great.
Next day - driving to work ( fortunately I drive by the repair everyday ). It overheats again...

Apparently the 'transmission coolant" hose popped off ?
No charge...

Keep your fingers crossed I am done.