On Sun, 19 Nov 1995, Dieter Dworkin Muller wrote:

> One thing I noticed and forgot to mention in the Gerbil update is an
> oddness in the rearmost cooling tin.  This is the piece that the fresh
> air tubes go through to connect to the heater boxes, and is on a level
> with the rear deck... [snip]
> In any case, in addition to the two holes for the fresh air
> ducts, and the half-circle things that go fit up around the heat riser
> tubes, are two more holes.  They're about two-thirds the diameter of
> the fresh air holes, and are slightly to the rear (FIF) and closer to
> the midline than the fresh air holes.  Any idea what these might be?
> 
> My guess is that they are for a later-model bus that has some sort of
> emission-control plumbing, but that's purely a guess.  My current plan
> is to cover them with duct tape, since all they're doing right now is
> allowing used engine air back into the engine compartment.

I've got a set of holes as you describe in the rear engine tin on my '76 
FI 2.0 L.  I haven't a clue what they're for (my guess was something to 
do with A/C, which my bus doesn't have).  I hose-clamped several sheets 
of tin foil over the holes to keep exhaust gases and road dust from 
getting sucked back up into the engine.

Tobin
(Do we have a new "silver socket" thread starting here?)

------------------------------------------------------------------------------
Tobin T. Copley                  Only Somewhat          =============  
(604) 689-2660                    Occupationally       /_| |__||__| :| putta
tobin@freenet.vancouver.bc.ca      Challenged!        O|             | putta
                                                       '-()-------()-' 
Circum-continental USA, Mexico, Canada 15,000 miles... '76 VW Camper! (Mango)