The windshield washer on my 87 5000SQ was getting weak in its squirting ability. After some poking around I removed the in-line check valve at the resevoir and voila I could wash the w/s again. Either the checkvalve is bad or the motor/pump is weak (I'm theorizing here). Anyone else had a similar problem? ...and, what is that valve for anyway (it seems to work ok w/o it) ? Mel