Hey Jimmeh, I've got an XJ with one real slow window. The others are not very fast but all work at the same speed so I reckon they are normal. I haven't tried to do anything about the slow one yet but here's what I think. Either voltage is low (easy to check), the window is binding or the motor is weak. Of these three possibilities I'd bet on the second one as the most likely (binding). If I decide to do anything about mine (it's not that annoying yet) first I will try spraying some silicone based lubricant or a little Armorall in the tracks in the upper frame. Then if that didn't help I would pull the door panel and see about lubing some other parts. I've found the Chrysler window motors to be very reliable though the drive gears tend to disintegrate on older vehicles. You can swap the motor with another to see if it's at fault if the lube job doesn't help.
About the A/C. My brother's XJ's A/C clutch went bad and made strange noises at odd times even though the bearing was OK and the A/C was not turned on. He shopped around for a new clutch assembly And ordered one from Partsamerica.com for something like $120. After it was a week or two overdue, he contacted the supplier and they said Oh, we cancled your order because the part is no longer available and , BTW, the price is now $180.

Nice of them to raise the price of a part they can't get!
Anyway, A friend has a couple of parts XJ's and he is donating a clutch to the cause. What I'm saying in too many words is, if it turns out you need a clutch assembly for your compressor a junk yard may be the best bet. Good luck with your new Jeep! <img src="/forums/images/graemlins/cheers.gif" alt="" />