I must agree here. As I have put into the archive on several occasions, the
cooling system (radiator, pipe size, liquid capacity) are far more than
needed for the Vanagon power output from either of the WB motors, all of the
inline fours and even the Subaru six. As I recall, the cooling system could
support a 427! Marginal it is not. It has a significant problem with air in
the line, as do all watercooled systems.

Frank Grunthaner