Just to chime in on rear mounted rads.
The problem is getting airflow. The factory cars had the advantage of a windtunnel and engineers to calculate flow. You CANNOT guess that a few ducts will be plenty. You CANNOT double the volume of coolant to overcome poor airflow, doesn't help at all.
Mine now works like a charm. What worked for me? Stripping back down to a more basic system in the rear AND adding a small FRONT mounted rad. I waaayyy over engineered the rear trying to compensate for lack of airflow, all sound ideas, agreed upon by others as the thing to do, got worse with every thing I tried... until I added the Boxster rad up front.
Jeff-
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No current VW projects
54 Chevy wagon LS2 AWD
56 Chevy Panel "Lost Cause"
VKG Bastage child
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