My '97 Sahara had LOADS of water leaks. All were noted on TSBs from Jeep and had to do with water leaking from the AC, water dripping in through the cowl and some defective gaskets. Here's the links (hope this works..!)
1997 4.0L http://www.alldata.com/TSB/04/970406D2.html
1998 4.0L http://www.alldata.com/TSB/04/980430D2.html
1999 4.0L http://www.alldata.com/TSB/04/990406D2.html
There are none listed for the 2001 Wranglers yet. Hope this helps.
(waiting for my 2002 TJ.....)