Hey!
A very big "thank you" to everyone here for answering all of my newbie questions for the last few weeks. Last night, I went out into the garage and nervously got to working on the Explorer.
I changed the drive belt. The old one was in really bad shape, cracks everywhere. It was a bugger yanking on that tensioner pully with my left hand and trying to wrench the new belt onto another pully at the same time.
Air filter, easy.
Drained the coolent, easy.
Replaced my bum thermostat. That housing was really in there. I scraped the skin off my hand trying to get it out from under that pipy looking thing on top because I was too nervous to try to take that complicated thing off (see, newbie, don't even know what it is, looks like a carborator?). I finally got the stat out and replaced it with a Stant and a new O-ring.
Backflushed the heater core. This went pretty smoothly except that I ended up spraying water all over the place on accident. No rust or sediment in either the heater core or the radiator.
Refilled everything, put everything back together, and the truck runs! (At least I was surprised) Not only that, the temp is nice and steady now and the transmission problems I thought I was having went away! Thanks again to everyone here for your help.
-troy