Hi all,
 I picked up an 82 Vanagon diesel and it needs a coolant
   expansion tank and cap.  It seems that the one I have has the wrong cap
and
   even if it was the right one the lip it's supposed to seal against in the
   inside of the filler neck is quite pitted and corroded.  This is causing
it
   to suck air into the system which ends up in the heater core and seems to
be
   the reason why I'm not getting any heat no matter how much I bleed the
darn
   thing.  (does this sound plausible or am I up the wrong tree here?)
   Anyway, If anyone has a tank and a correct cap for sale I would be happy
to pay      a fair price for it.
  or any info that you could bestow on me would be very appreciated.
  PS
  This tank is unique to the diesel as it has a smaller upper hose attachment
area   than gas ones I've seen.  Also it has no coolant temp sensor or sensor
hole even.
   Keith Olsen
   82 Vanagon Diesel L
   87 Vanagon Wolfsburg GL
   85 Golf Diesel
   79 Loaf