BMW 2007 328i Convertible Owner's Manual

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Checking coolant level
1.
Let the engine cool.
2.
Turn the cap of the expansion tank a little 
counterclockwise to allow any accumulated 
pressure to escape, then continue turning 
to open.
3.
The coolant level is correct if it is between 
the maximum and minimum marks in the 
filler neck, refer also to the diagram next to 
the filler neck.
4.
If the coolant is low, slowly add coolant up to 
the specified level; do not overfill.
5.
Turn the cap until there is an audible click.
6.
Have the reason for the coolant loss elimi-
nated as soon as possible.
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