Saab: saab 9000 2.3 turbo 94 N reg, saab 9000, climate control

Question
air con.(climate control) comes on full as soon as the ignition is switched on,fan at full speed. have to remove fuse to switch it off, otherwise seems to work OK?

Answer
I am sorry, but my hands-on experience is limited to vintage 900's (pre-1990). However, from your description, in order of priority, I would check: (a)  The climate control relay (stuck on); (b) A short somewhere in the wiring (ugh!); & (c) a faulty control computer.