Bimmerfest - BMW Forums - View Single Post - Check coolant light, coolant is tad low, but "bobber is full up
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Old 11-15-2010, 06:18 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
I am perplexed by the symptoms; so all I can offer is a link that you probably already know about which shows an expansion tank autopsy.
- BMW E39 Expansion Tank Failure Analysis

We're all guessing, but, apparently, the electrical coolant level sensor and the floating stick are separate items, connected, the assumption was, magnetically.

If that's true, (that it's two separate sensors coupled together), then it's "possible" that one would read low while the other read high ... although one would think that unlikely.

BTW, my only experience with the float is here (so take what I say with a grain of NaCl):
- My radiator floating level indicator seems to be MIA (where does it go?)

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