After an hour of searching in the locations denoted in my Haynes manual and various web sites I still could not find the PCV valve or hoses. Bottom line on my particualr Explorer you cannot see it in the engine compartment. It is WELL hidden so don't even bother looking even with a flashlight. You have to feel around and find it. [...]
Thanks 0mn1p0tent! This really is a 5 minute job BUT took me 2 hours cuz I couldn't locate the valve and kept walking back and forth to my computer to look at pictures. I'm sharing this to hopefully help others lessen their time.
0. First, at least on the 2000, there's not a front hose that you have to remove from the PCV. It just goes straight into the intake.
1. As someone else mentioned, I don't like pulling out hoses I can't see

so I got a stepladder, got my knees onto the front frame, leaned onto the intake manifold, took a flashlight and peered between the xmission dipstick and the manifold. (Glad there wasn't a camera around

) It's down there! Hose came out easily. Lift straight up and you will get *just* enough clearance to replace the valve.
2. Got confused because the grommet came out with the PCV. When I think of "grommet" I never would have thought of this. It's rigid plastic and is threaded on the bottom, even though it doesn't screw into the intake. Simply pull it off the PCV/hose assembly.
3. There's this giant foam ring on the upper side of the PCV, wrapped around the hose. This made for more confusion; between the grommet and the foam, the valve itself is invisible! The foam would not slide up as shown in some pictures; mine was attached (perhaps melted a little bit), meaning I had to tear it on one side to get it off.
4. Once you get it off you will see the top of the valve; mine was marked "Motorcraft EV-152". Determined pulling will remove it from the hose.
5. The replacement part I bought at Autozone was zinc in color rather than black, and it had a rigid plastic 90-degree elbow on it, which is not necessary for the 2000. I couldn't pull it off (the valve has a barb) and ended up using a box cutter to split the rigid plastic and get past the barb.
6. Insert the new PCV valve in the hose, rewrap the foam around the hose, stick the bottom end of the valve into the grommet, clean the threads on the grommet, and reinsert gromment/PCV/hose back into the intake.