I have been getting my '90 245 back on the road again for the last few weeks and wanted to pass along a few findings from some of my diagnosis and repair.

First: Passenger window went down, wouldn't go back up. I started at the pass door and swapped the switch, tried a spare motor, swapped the polarity on the switch (window went -up- but not -down-) traced the wiring back to the relays behind the dash and swapped them; nothing worked. Then I went to the driver's door switch. Swapped it with one for the back windows. Worked! Put the switches back to original, everything OK again. Also want to pass along that the whole system is wired through the driver's side switch cluster. Lesson: start there first!

Second: Cruise control doesn't work. It hasn't worked for a couple of years and once in a while when it did I had that "drive-you-crazy" hunting problem: up and down, up and down. Checked the vaccuum pump, the pedal switch, all the vaccumm lines. Nothing. Then I found a few posts in here about the servo motor for the throttle getting a little hole in it where it rubs under the dash. My '90 has the servo under the dash connected to the gas pedal. Pulled the knee bolster and the servo: Sure enough: a -tiny- hole where it had been rubbing the heater hose for the last 13 years! Patched up with some of that black 3M weatherstrip cement. Works!!! Lesson: If you have that "hunt-and-miss" syndrome or if your cruise has quit all together, check this first!

Third: My vaccuum heater controls make a "hiss" noise when the "recirc" button is out. (No noise when pushed in) Swapped it out, no change. Several people mentioned the recirc servo motor as the likely problem. Guess what? You can't get to it!!! (not that I can figure out anyway...not even in the salvage yard when half the dash is out of the junker!)
Lesson: Live with it because this is that "Volvo starts building the 240 with the heater and the rest gets built around it syndrome!

Finally: I go through the '91 745 fixing all the burned out bulbs in the dash. I finally tackle the shift indicator bulb. Anyone who has done this knows it's a nightmare! I'm getting tired and while I'm trying to get the #@%# bulb back into the socket, I get a little short because I left the dash lights on. Now all of the lamps in the console (shift, heated seats, read ash tray light) adjust exactly -opposite- of all the others: put the dimmer on high, these go OUT, put it on low: they are full bright!! It's only when I notice that the tail and parking light on the passenger side are now out that I start to look further. Turns out I blew the fuse when I got that little short. Lesson: The console lights will still work, but opposite the adjustment of the dimmer setting. Replace the fuse: all back to normal! (Did Lucas Electric design this section of the system)

Hopes this helps someone out there!