Fan runs with heat on

[Navistrpwr at aol.com]

After several weeks of driving around in my 86 5kT with a hat and gloves on,
I decided to bite the bullet and improve the lack-luster performance of the
car's heating system.    I started at the A/C programmer (it's an early 86
model w/ the non-digital control) and replaced the motor that drives the
bowden cable with one that I got at the junkyard.  The old motor would always
stick in the A/C position.  With that problem fixed, I replaced a faulty
vacuum solenoid in the programmer, moved under the hood, and popped in a new
thermostat (after installing it, I read somewhere that the thermostat should
be positioned in the housing so that the bar on the front of the thermostat
is in the vertical position...does this really matter?).  These fixes helped
improve the heat somewhat, but it still doesn't perform nearly as well as the
heater on my brother's 5k.  One thing I noticed is that the 1st stage cooling
fan always runs with the climate control on, regardless of whether or not
it's set at 60 F or 90 F.  This isn't normal, is it?  I'd say it isn't, as
the engine never warms up sufficiently with the climate control on.  I talked
w/ the parts guy at my local Audi dealer and he said that the system is
getting an A/C signal somehow.  He pointed to the A/C control head and/or the
temp sensor on the evaporator housing as the culprit.  I've replaced the
programmer, control head, and temp sensor with units I got at the junkyard to
no avail.  I replaced the radiator fan control switch with a brand new one
(and am glad that I did so...I didn't realize the 2nd speed fan was
malfunctioning, it would always run at high speed...fixed that problem)  I
also tried disconnecting the high pressure switch on the condensor to see if
that would be causing any problems.  I'm at a loss for what else to try.  The
only way I can get the fan to shut off is to remove the 1st speed relay in
the fuse box under the hood.  However, I put it back in so the after-run fan
will still work.  Any ideas as to why this fan constantly runs?

TIA,
Ray McCarthy