mmmkay...

You're gonna die of heat stroke in that car! :)

Fan switch and A/C might be related (could be same problem causing both).

Why don't the windows roll up or down?  Are they electric or manual?  And
it's both of them that don't work?

Electrical issue there, could be the wiper stalk is broken and in the on
position all the time, maybe something is wrong with the intermittent wiper
relay, or something is stuck feeding them 12V+ all the time.

For a diesel VW that's reasonable.

*Anything* that is more or less running and in legal/registerable shape and
isn't rusted or smashed to hell is worth $1000K in my humble opinion.

Hopefully, yes.

It depends on what's wrong with it.  Is it a seized compressor or a leak
or...?  You'd have to find out.

A well maintained diesel should be fine.  If you get a year's worth out of
the car w/o putting any money into it, it will have paid for itself by then.

A gas VW engine will run fine at 300,000 if it was raised in Georgia
or other similar not harsh climate. Diesels are supposed to last even
longer. I have not lived up north in years so I do not know how long
VW engines last in harsh cold winters. It seems that in Ohio the cars
rust out before people get that many miles. At least the people I grew
up with that do not drive the crazy miles I drive down here. My 2003
Jetta diesel is running fine at 155,000 miles. My 87 Toyota pickup at
260,000 miles runs fine. Well not really as I need to do valve stem
seals and an air flow meter but what do you expect after 20 years?

AC could be just some freon or worse. If it has window cranks then it
should be easy enough to fix. Power windows can be more of a
challenge. Fan switch might be a blown fuse. Wipers always running
could be a bad switch, a stuck relay or crossed wires.

You did not state where you live but $ sign suggests US or Canada.

I am looking at a 1987 Jetta Deluxe Diesel 2 door that a guy down the
street is considering selling. Runs good, looks fair, 1.8L 5 speed, 210,000
miles. A/C does not work, windows won't roll up or down, and fan switch
isn't working. Also, for some reason the wipers run constantly??
 However, he tells me this car gets over 40mpg. That beats the heack out of
my current 12mpg truck! Could someone advse me what this Jetta may be worth?
He thinks he'd like to get around $1,000.00 for it. And anything I should be
watching for? I assume the windows cranks and fan are minor repairs, not all
that worried about the A/C if it would be a huge expense. This would be my
first diesel vehicle. Is the 210,000 miles too high to consider? Or is it OK
on a well maintained diesel engine?
 Any advice will be appreciated!

 Thanks!
 Tim