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The rear washer fluid come from the windshield washer fluid reservoir on your 1999 Ford Expedition ( according to the owners manual )
Same place as you fill the front washer fluid. There is only one reservoir.
It is pumped in from the front washer reservoir.
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 only one Windsheild Washer fluid reservoir that serves both the front and back.
The 2009 Ford Flex draws its rear washer fluid from the same reservoir as the front.
the rear washer pulls from the front...fill the front end and the rear should work.
You fill the reservoir under the hood.
By filling the fluid container under the hood. There are two motors attached to the underside of the reservior. One for the front winshield washer fluid, and one for the rear.
My 98 impreza just pumps from the front washer tank to the back
The rear washer feeds from the same reservior as front, if you look you have 2 pumps in reservior.
The washer fluid containter is in the cargo compartment; I believe on the right hand side. There is a little compartment that contains the washer fluid reservoir.