passenger side fender well
The washer fluid for the liftgate is supplied by the reservoir for the windshield ( according to the owners manual )
With your eyes.
Mercon ATF
the washer jug is under the hood on the right sideclose to the batery the washer jug is under the hood on the right sideclose to the batery
The rear washer fluid come from the windshield washer fluid reservoir on your 1999 Ford Expedition ( according to the owners manual )
Starting with the 1997 Ford Explorer the rear washer fluid is supplied by the windshield washer fluid reservoir in the engine compartment
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 )
On a 2007 Ford Focus : Just the automatic transaxle ( transmission ) has a fluid level dipstick It is in the engine compartment towards the front of the vehicle ( that's not where I would be looking , but according to the drawing in the Owner Guide that's where it is )
I have a 92 Ranger, I found my washer fluid pump directly under the washer fluid reservoir.
The windshield washer bottle, on a Ford focus, can be located in the engine compartment. The container is near the front of the engine compartment on the drivers side.
In relation to the washer fluid, check if the fluid tube is not twisted or blocked in anyway.