Heat/AC panel and fuse 48

[smoothhd]

I've had this problem lately with my 02, 4.4 auto a/c. Fuse 48 blows within seconds of start up. I searched and found several people here that have had a similar problem. One person suggested blowing out the sensor fan on the control panel. I did that and it worked long enought to give me a false sense of success, the fuse blew again. So, more searching, first for a wiring diagram but found nothing useful. Most every post I found that had fuse 48 blowing ended up replacing the Heat/AC control panel and that was the fix. I found one on ebay, relatively inexpensive, and installed it but the fuse still blows. It lasted for 6 or 7 starts then it was done. My question..... what else does fuse 48 power? My fuse panel diagram says it controls AC and heated washers but I don't have those. Where can I see a wire diagram without throwing down bucks for a Bentley? Thanks for any help.