Symptoms were temp increase after short hard acceleration. Once it got hot it would never cool down even 6th gear at highway speed. Next day it would be fine until you got on it again. I had thought this problem went away with the 01's. Chuck set me straight. Shaft starts spinning under hard acceleration and starts melting the plastic of the pulley. No waterflow in motor after this happens. Once it cools all the way down plastic would grab until hard accel again.
Had me pretty confused, thought I had a stat not working right, changed that, not needed however.