Has anyone else had problems with water running out of their rear window washer & emptying the washer bottle on their GU Patrol? My local dealer says they cannot find anything wrong with it. This is particularly annoying as my driveway slopes uphill, so I can see it literally running out of the jet when I pull up in my driveway. Someone else has told me there is a check valve somewhere in the water line that could be the culprit. Can anyone tell me where to find this valve & how to fix the problem?