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[QUOTE=Turbolader;10530441]In this thread, they briefly talk about where the petcock valve is, which is on the bottom of the radiator, but the factory FMIC is in the way, so I think (I don't know for sure) you have to remove the FMIC to get at it.
According to Harold at HPautowerks you have to drop the intercooler to access the drain cock. Check the threads on 135i cooling which is still active. Hope this helps
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