Old enough to smoke?

[<DILLARDP@edu-suu-lifac.li.suu.edu>]

Strangely weird thing happened this weekend.

I got into my '71 Square, thought "life is good", started the engine,  
and then....within 15 seconds of starting I had
white smoke billowing out of the left defroster vent at the
base of my windshield!  Turned the engine off and the smoke
continued to come out for another minute or two (as I sat there
nervousely fingering my fire extinguisher).

A quick glance under the dash and in the engine compartment
showed no sign of anything sizzling.  I didn't get down to
examine the heat exchanger/exhaust system because I was wearing my good
clothes.

As I had company all weekend, I never got to look at the
car again.

Now, I must say I am a little bewildered.  What would cause smoke to
billow out of a defroster vent?  And for the smoke to start so
quickly?  

I won't get to attend to the vehicle until next weekend, so...if any of
you VW sleuths have some ideas what I will find, I would be
mucho apreciado for your suggestions.

Life still is good, but will be better when my sweet little Square has
stopped smoking. Sure don't want it to get cylinder cancer!

Thanks in advance.

Phil
dillard@suu.edu