View Single Post
Old 08-04-2013, 07:24 PM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 23,175
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)?
Attached Thumbnails
Click image for larger version

Name:	expansion_tank_cap.jpg
Views:	911
Size:	26.9 KB
ID:	389804   Click image for larger version

Name:	stream_of_water.gif
Views:	581
Size:	261.9 KB
ID:	389816  
Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 08-04-2013 at 08:43 PM.
Reply With Quote