Well ive been off the forum awhile(which means the d2 is running well). Let me start by saying the truck is a 2000, and has 144,000 on the clock. Ive done numerous repairs in the last year(to many to list). And yes before anyone asks it has had the maint. for high milers over 90,000. Recently I took a trip to NJ and on the way there i noticed a waterfall sound behind the dash when I accelerated from a stop. I bled any air out of the cooling system that i could get out. The heat still gets very hot,and the core isnt leaking on the passenger side. Anybody thats had this problem and FOUND a solution please post, Thanks in advance, Jack.