I took the advice of other listees and picked up a heater blower motor
switch at lunch and just installed it. It was so easy that it's worth
mentioning the process for those suffering from malfunctioning
switches.

The switch cost about $5.50 at my local VW shop, so don't put off doing
it because of the expense. It's so easy to replace that that shouldn't
be a deterrent either.

When you pull off the lever knobs, switch knob and the control
faceplate, you're looking at the switch on the right. Visible are four
plastic lugs that look like you would pry them and pull the switch out
the back of the metal panel. Don't, it's much easier than that. Get a
fingernail or screwdriver outside (to the right of) the spring metal
clip that stands about 3-4mm away from the body of the switch. Push it
to the left and pop the switch out the front. Unplug, plug in the new
switch, reassemble and enjoy tepid air even while stopped.

Jim