It should be under the tank that holds the washer fluid. remove the bolts that holds it on and turn it over, unhook the wires and it should just pull out. Replace it with the new one and put it back together.
The rear washer fluid come from the windshield washer fluid reservoir on your 1999 Ford Expedition ( according to the owners manual )
On a 1999 Ford Expedition : The washer fluid for the rear liftgate is supplied by the same reservoir for the front windshield ( located in the engine compartment )
There is no washer relay.
The windshield washer pump on a 1999 Ford Explorer moves washing fluid from the reservoir and sprays it onto the windshield. It is capable of spraying in a constant stream or in pulses.
It is attached to the bottom of the washer fluid reservoir.
There is a fuse for the windshield washer pump, on your 1999 Ford Ranger. You can locate the correct fuse by looking at the diagram on the inside of the fuse box.
In the 1999 Odyssey it is located in the base of the washer reservoir.
The washer fluid pump is on the bottom of the washer fluid reservoir.
You can find your 1999 Ford Expedition front windshield wiper fuse in the fuse box. The windshield wiper fuse will be in the second column, fourth from the top.
Container, right front side of engine compartment, yellow oblong cap with a windshield washer drawing on it.
Radiator or windshield washer tank.
on the bottom of the washer tank good luck email me boy_dane @yahoo.com