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Old 12-05-2012, 07:15 AM
mlukas161's Avatar
mlukas161 mlukas161 is online now
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Location: WNY
 
Join Date: Oct 2008
Posts: 906
Mein Auto: 03 330i, 04 X3
Here is a DIY for the expansion tank replacement.
http://www.bimmerfest.com/forums/sho...d.php?t=415259

One for the thermostat
http://www.bmw330ci.net/maintenance/thermostat.php

Here is the complete cooling system overhaul.
It's probably time to do this if it's never been done.
http://www.bmw330ci.net/maintenance/completecoolant.php

I've never heard of a transmission leak in the X3's. It doesn't seem to be a common problem.
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