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Where can I get a replacement floating dip stick for measuring the coolant level in the expansion tank? I have an early 2005 645Ci.
 

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You did not lose it, probably broke it. I have same problem, but you can't buy it. It is built into the coolant reservoir. It is a one plastic floating piece that does not come out of the top. Look inside, you probably still see the bottom flat piece floating in there and that bottom part of the dipstick is too big to come out of the top. have to replace the whole coolant tank. Bad design. See link below.

http://parts.bmwofsouthatlanta.com/...2&ukey_modelRange=0&searchString=coolant tank

Shows all the parts of the reservoir that you can buy. Not the dipstick. If anyone thinks I am wrong, I'd be delighted to know.
 
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