>Glancing through the my 1964 owners handbook, the section on heating
 >says that by opening a cab side window or a vent wing the amount of
 >hot air flow will be increased. So your observations are exactley how
 >the system is designed to work - according to VW anyway.

Or at least, that's how VW found it TURNED OUT to work... Same difference?

Note that, in 1971, all Beetles grew a tiny, crescent-shaped vent behind
each rear quarter window. Guess what it's for...

 -Steve Maher   smaher@gi.com   '71 VW Transporter in San Diego... what's
                                 a heater?