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335D: I have a 335D E90 and the expansion/header tank keeps…

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I have a 335D E90...
I have a 335D E90 and the expansion/header tank keeps losing water but I can find no leak anywhere
Submitted: 3 years ago.Category: BMW
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Answered in 17 minutes by:
7/1/2015
BMW Mechanic: Steve, BMW Expert replied 3 years ago
Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 25,942
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what testing exactly has been carried out so far?
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