Hello Bluntz,
Have you used the "Search this forum" box yet? My story about a coolant leak should come up front center. I did fix it myself. I did it in my garage. It put the van out of action for two weeks, and it cost me $400.00. How bad did things get when you blew the serpentine belt? Heat wise, I mean? If your engine superheated, (Temp gauge maxed), you've probably warped a head. This can be fixed by removing the offending head, taking it to a head shop for a complete overhaul ($135.00 / head) and reinstalling with the new "more better" felpro mls headgasket kit. Now this is no walk in a park, but, it can be done by you, in your garage. If your game.
First, FIND THAT LEAK! I diagnosed my headgasket problem by traced my leak to the block/head connection by following a white residue trail from the drip point to the front side of cyl #4. The headgasket had failed because the head warped due to excessive heat. (Caused by my bypass hose failing).
Karl