I have a reply from the 5 series forum and there is another thermostat which I didn't know about.
RealOEM.com * BMW E53 X5 3.0d Expansion tank, automatic transmission
It's for the gearbox oil heat exchanger (no. 4)
RealOEM.com * BMW E53 X5 3.0d Oil-cooler pipe/heat exchanger
Hopefully this is my problem !
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04 x5 3.0d sport
Last edited by porka; 10-16-2010 at 05:18 PM.
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