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Old 08-04-2013, 08:24 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by gary@germanautosolutions View Post
The passage that the hose connects to enters a separate circuit between the two o-rings on the coolant cap.
I dug up my expansion tank autopsy photos (1) (2) (3) ...

Is this the start of that separate circuit in the expansion tank cap?

Does that hole in the expansion tank cap mate with this hole in the expansion tank neck?

Isn't that expansion tank filler neck hole the same hole that sprays coolant when the engine is off and the aux water pump is running with all the flap valves opened (as part of the normal bleeding procedure)?
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Last edited by bluebee; 08-04-2013 at 09:43 PM.
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