The rear seat does not come out. The middle seat is removable, after which you can slide the rear one up.
The washer fluid for the rear liftgate is supplied by the same reservoir as the windshield in a 2000 Mercury Villager
On a 2000 Mercury Villager : The washer fluid for the rear liftgate is supplied by the same reservoir as the windshield ( located in the engine compartment )
at roof
The rear seat is not designed to be removed. You can remove the center seat and slide the rear seat forward.
It mostly uses pop-off fasteners. There are one or two screws at the top for a cover.
The rear seat is not intended to be removed. You can remove the center seat and slide the rear on forward into it's place.
With the correct sized socket, obviously.
The rear seat isn't designed to be removed. If you have a center bench seat you can remove that by unclipping it, then slide the rear seat forward.
It's on the top rear edge of the lower transmission housing.
There are 3, or 4 if you count the rear cradle mount.
You will need to remove the inner panels to gain access.
The vehicle speed sensor is at the top rear corner of the transmission housing.