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When the washer fluid light comes on any vehicle it means the fluid is low or empty. You can refill the washer fluid in the plastic jug located under the hood.
The washer refill bottle is under the hood between the bumper and the radiator to the right of center and has a yellow wiper cap on top.
It's the one next to the washer fluid refill cap.
On a 2006 Ford Expedition : The washer fluid for the rear liftgate is supplied by the same reservoir as the windshield , that is located in the engine compartment
The washer fluid for the rear liftgate is supplied by the same reservoir as your windshield ( located in the engine compartment ) on a 1999 Ford Explorer
The washer reservoir is located behind the passenger side head light, It is a white plastic container with a black cap, that has the washer symbol on it like the one on the steering wheel stalk.
To refill your windshield washer fluid, you must locate the dispenser under the hood of your car. Near the oil, there should be another cap that has a picture of a windshield on it.
When standing facing the front of the car, the windshield washer reservoir on a 2002 Ford Focus is located on the right hand side near the fender well. The plastic cap lifts off for easy refill.
To replace windshield washer bottle Remove 1 Battery 2 Battery tray 3 electrical connectors 4 Washer Tank
On my 1988 Van, it is located on the upper right after you open the rear door. I hope it is on the same location as yours.
The rear window washer is fed from the front window washer tank in the engine compartment
iN THE REAR DOOR OPENING.