Just bought a 90Qs 20V with a "few" issues.

[Kent McLean]

Tigran Varosyan wrote:
> #1 Driver side door lock does not work. I hope that this is the same problem
> as described in this article:
> http://members.aol.com/c1j1miller/body.html#Door%20Lock%20Repair

That's the most likely fix.

> #2 Engine coolant gauge does not seem to be working - it is always showing
> low. However, at the same time, the car heater is not very hot. The radiator
> and engine get *warm* but not as hot as I would expect. 

Most likely the thermostat.

> #3 The oil temp gauge is also showing 60c and does not move. 

It may be the sensor and not the gauge, or the wires/connection to
the sensor.  Or it may be when you replace the coolant thermostat,
the engine will get warmer and the oil gauge will be "fixed".

> #4 Driver side rear window does not roll down. Please advice on common
> causes.

Common cause: broken wires in the driver's door rubber boot, between
the door and the jamb.  Peel back the rubber boot and look for broken
wires or wires with broken insulation.
http://members.aol.com/c1j1miller/body.html#Window%20down%20fix

> #5 Driver side headlight cracked - please advise a good source for a
> replacement. Are there any improved "euro" or other headlights that I should
> look at getting?

Euros tend to be expensive (unless you get lucky on eBay). For used,
try chris at force5auto.com or www.shokan.com.

> #6 One of the foglights is also cracked - where should I get it?

Same.

> #7 
> Between the front bumper and the grill there is a molding stripe that is
> held down by two screws located behind the headlight washers. The covers
> that go over these screws are missing - where do I get them?

Same.

> #8 I have driven a 90 a few years and I remember
> it having quite a bit more power... Any ideas?

Put a turbo on it. :)

> #9 I would like to keep the diff locked
> when playing in the gravel at 60-80mph. How to I override this "feature"?

Works as designed. The diff lock (on the 200s) is vacuum activated under
the rear seat. To override it, a search of audifans.com using (diff lock 
vacuum rear seat) finds lots of hits, like these:
http://www.audifans.com/pipermail/s-car-list/2002-September/004724.html
http://www.audifans.com/pipermail/quattro/2002-January/045674.html

> #10 The E-brake completely does not work. When pulling the handle, I feel no
> resistance. Common possible issues?

Broken cables. Cam/Pivot rusted/frozen in place.

> #11 The Oil pressure gauge gets pegged at 5BAR at around 3000RPM. 

Seems normal to me.

> #12 Again, maybe I am just not used to it, but this motor seems to have an
> issue with running momentum - as if the flywheel is REALLY heavy. 

Sounds normal to me.  The flywheel is heavy.

> #13 The back of the passenger headlight seems to have a hose that leads to
> the header heatshield. 

Not me. Some Audis (the early V8s) have heated headlight washers.
It could be that.

> #14 Although they worked on the test drive, my high beams do not work at
> all. 

No relays, but you should put some in:
http://www.humanspeakers.com/audi/headlight-simple.htm

> #15 The driver side front seat has seen better days. What's the solution? 

If you mean tears in the leather, the used vendors listed above, or
eBay.  If you mean cracks and wear, Lexol (www.lexol.com) or Leatherique
(www.leatherique.com/) to restore oils to the leather and make it supple
again. Maybe some dye to color it.

> #16 I already bought the car, but I would not mind having a CarFax for it.
> Does anyone have an account?

Not me.

I hope you have fewer questions over the next 50 miles. :)

-- 
Kent McLean
'94 100 S Avant, "Moody"
'89 200 TQ, "Bad Puppy" up in smoke