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I'm guessing this is a newer Durango? You have to let us know what kind of D you have or we will not know what to tell you. If it is the 98 to 03 model then you only have the front windshield washer fluid tank with a pump for the front and a pump for the back...
I guess in some ways it's better god forbid mine ever get a busted line that would be a PITA to fix I would propably just plug up that part of the reservoir. Also a lot less line to freeze up in the winter. I used the stuff that was supposed to be good up to -30 degrees and it still froze in the lines. [:@]