I think the Box S is open to the sides behind the center rad so it just vents through the side radiator ducting. Not ideal but clean and simple. Looking at Pedro's DIY he addresses the incoming air duct but not ducting after the rad. I suspect it goes down and to the sides.
http://www.pedrosgarage.com/Site_3/Install_3rd_Radiator_%26_Coolant_System_Bleeding_I nstructions.html
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 06-01-2011 at 07:29 AM.
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