The air condtioning on my 1992 240 seems not to work. When I flip the toggle switch on the dash the blue rectangle on the switch doesn't light up. I assume it's supposed to, since the corresponding lights (red and orange) on other toggle switches do light up. This makes me think the problem may be electrical. The fuse (position #12) seems fine, and other things that depend on that fuse (seat belt light, reverse lights etc.) do work. So could it be the relay? I understand the relay is in the dash. Anybody know how hard it is to replace one? Or am I on the wrong track altogether?

This is my first Volvo and I've ownly owned it for three (winter) months, so I've never needed the air.

Thanks to folks who've answered my questions in the past. You've save me some grief.