Originally Posted by FazerBoy
The diagram on the expansion tank is confusing.
I interpret it to mean that when full the LOWER of the two bubbles on the floating stick should be level with the lip of the filler. That would mean that the HIGHER bubble would be above the level of the lip.
That's what the diagram looks like to me - but who knows??
First, you need to check the coolant level when the engine is COLD>!
When you check the engine coolant when it is cold it will be at the MIN MARK.
So... the top of the"float dip stick"
should be FLUSH or LEVEL with the top of the exp tank threads.
Don't get too caught up on what the dip stick diagram picture is... I think it is more important to see that the "float di stick" is not lower than the top of the threads of the tank. Like I said in my OP, mine was just SLIGHTLY low.
I guess this is why BMW has given us a "low coolant level" warning light.