Yep, this happened to me, been several years back, dont recall exactly. Its on a 95. One day i noticed a very slight, REAL slight vibration while sitting at a long stop light. HMMM, fan vibrating. Sure enough, all the blade tips were melted, and not a whole lot of air being expelled thru the vents.
I got a metal blade from Muzzy's. Aggravating little job installing but its been working good ever since. It is a bit louder, but air-flow seems to be a bit more than the o.e. blade.