Try to trace the hose back from where the water sprays out to wash the rear window.You should find the source that way.Open up your hatch or trunk and look for a label or cover that may be over the reservoir.The rear window washer might share the same reservoir as the windshield washer too.That is on the passenger side toward the front of the engine bay.You can also hit the rear washer switch and locate the reservoir by the sound of the pump.If there is no sound,then your pump isn't working for some reason.maybe wiring,bad switch,or pump.
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