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Old 01-16-2013, 11:47 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 19,190
Mein Auto: 02 BMW 525i M54 automatic
This is a well discussed topic, at least with respect to Behr:
- Behr radiator and Behr/Heat expansion tank autopsy (1) (2) & request for another Behr surge tank autopsy (1) & why new Behr/Hella expansion tanks are DOA (1)

As for the cooling system identification, we covered all the numbers stamped on the outside of the plastic and other telltale clues in this pictorial thread:
- Cooling system date stickers & radiator date codes & markings (1) (2)
Note: Your mission, should you decide to accept it, is to 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, in seconds!
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