mine is a facelift interior 2003 52 plate and is "OKT" for a few more days and I have fahrenheit temp controls too.
I was about to post and ask if the temp could be changed after spending ages looking through the menus for anything that suggests a change and the manual for a secret "hold button x, y and z for 10 seconds" type of instruction.
I have even been baffled by the myriad of settings and am sure I have opted for the least economical setting of all by having as many of the lights as possible on at anyone time - with climate, recirc, two lights on the auto setting and mono and 70F.
Occasionally, over bumpy roads (and Glasgow is by far the worst for potholes, sunken utility reinstatements, covers etc) the temperature will take a life of it's own and alternately freeze me then fry me!
Sometimes turning the control anticlockwise the temp will fluctuate wildly more up and down. Me thinks the rotary control is a little sensitive - but only by selecting everything as above (apart from the quick clear demist setting - which is ace btw) does it seem to remain stable.
Ah, the joys of owning an Alfa. Fingers crossed it is the least of my worries - and I love the 5 pot roar.