Here's a reply to myself. Since I haven't gotten any and I THINK I may have figured out what the problem is, I thought I'd post this for reference.
I THINK I figured out what the problem is just from talking with automotive electricians and coming across the following post.
If the link for some reason stops working, here's an excerpt:
Had planned to ask your advice but my son found the trouble and I want to tell you about it. During a trip, using cruise control at 70mph, it suddenly went off and never returned. Simultaneously lost heater blower and operation of sideview mirrors. Suspected ground connection. Had to remove most of the dashboard to check out all grounds. Also under the hood. Cleaned them, reconnected them and everything worked for a minute or so, but lost them again. Also checked all related fuses, found that they had to be cleaned. Using the manuals for a 2000 Buick Century, he eventually found that I needed a relay for the blower. However, the big cause of the problem was found in the ignition switch. Replaced both relay and ignition switch. The relay was not the cause of the problem but it needed replacing. Problem solved!!!!!!!!! Never would have believed the problem was in the ignition switch!! I just wanted to write and let you know - some problems seem easy to solve but definitely are not!! This was a major job - took 2 days in 35 degree temp and outdoors. Cost $156 plus tax. Thank goodness for such a wonderful son!!!!
So I think I'll try to find a cheap ignition switch and give this a go and hope that it fixes the problem!
Friday, January 18th, 2008 AT 5:36 PM