Quote:
Originally Posted by andrewwynn
I'm pretty sure the coolant res is in the active loop and already pressurized. Not sure how you would vent into a pressure zone. That said I never saw an overflow tube either
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Yes it is. I tried to find where I read about how the cap equalizes the pressure between the rest of the system and the ET. In my futile search, I read a bunch of other contradictory stuff. In the end, I'm still not sure if it accomplishes anything to run the lower pressure cap. Why did BMW spec such a high pressure cap? Surely it wasn't because it was just a nice round number!? 
AM.
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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)
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