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Old 03-13-2013, 05:16 PM
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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 just realized, from Aussie528i's post below ... that the fluid flow through the expansion tank is DIFFERENT for each of these four E39 engines;
1. M54 expansion tank fluid flow
2. M52TU expansion tank fluid flow
3. M52 expansion tank fluid flow
4. M62 expansion tank fluid flow

Originally Posted by Aussie528iT View Post
There are a number of different threads on the board so maybe they need to be combined. I have read many of them and there are some quite divergent views about the cooling system components and how they work. Many don't understand that the M52 and M52TU engines are completely different animals. It probably would have been better if BMW had called the M52TU the M54 and the M54 the M54TU. The M52TU has much more in common with the M54 than with the M52. The fact that the M52TU has a throttle cable but is still "fly by wire" seems to cause confusion as well.

Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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