BMW M6 Convertible 2007 - Manual (Page 208)

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3. The coolant level is correct when the upper
end of the float rod is at the same height as
the upper edge of the filler neck, also refer
to the drawing 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 it clicks.
6. Have the reason for the coolant loss elimi-
nated as soon as possible.
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