JUst because the car has an alarm doesn't mean that it has a remote
entry.  In fact, it's pretty unlikely.  The alarm is set (and unset)
whenever you lock (or unlock) the car with the key in the driver's door.

Don't have the complete answer you need, but if the alarm is setting off the
horn, disconnect the horn for now.

Good luck.

-root

I have a '91 Saab 9000 and can possibly answer a few questions.  Check the
LED on the left speaker grille.  If it blinks even when the doors are
unlocked, the alarm system is probably in the "transit mode".  It goes into
this mode after the battery has been disconnected.  IIRC, the method to get
it in the normal mode is to put the key in the driver's door and turn it to
the unlock and then lock position.  Then repeat this unlock/lock two more
times so that your 3 unlocks/locks are done within 5 seconds.  That may turn
off the alarm.   If this fails, you can remove the alarm control box and
jumper the connectors that control the ignition kill.  The control box is
under the dashboard at the far right in front of the passenger seat and
under the glove box.  You should be able to easily find it by taking out the
glove box (assuming this is a left hand drive car).  I think it is a Bosch
part that is sort of bronze colored and a bit larger than a pack of
cigarettes.  FYI, there is no kill switch or key fob for this model year.
The alarm is activated/deactivated by locking/unlocking the driver's door.
If you want to set the alarm without the motion sensor (for parking at the
airport, for example), lock the door, and within 3 seconds turn the key to
the lock position once again.  If you want to lock the doors without setting
the alarm, turn the key to the unlock position before turning it to lock.
The entire alarm system is controlled by the key in the driver's door.
Maybe one of the switches there is broken so that the alarm no longer turns
off, but this is unlikely because the immobilizer portion of the alarm would
also prevent you from starting the engine.

If your heater fan is part of an ACC system and not manual, the fan going to
high speed is a failure of the ACC fan speed control.  This speed control is
under the hood behind the false bulkhead on the passenger side.  It isn't
too difficult to replace the part, as long as you get the really tiny Torx
screwdriver needed to remove the screws that hold it in place.  Until you
get a chance to fix it, pulling fuse #6 should turn off the fan.  I cannot
see how the alarm and the fan problems would be related, unless a voltage
regulator problem (or some other electrical fault) caused them both to fail
at the same time.

I guess I haven't missed anything by not going back to the Saab dealer for
service in the 8 years I have owned my 9000.  I hope this helps.

Walt Kienzle
1991 9000 Turbo