When I traveled down to Austin to get the canoe, I accumulated a lot of bugs on the windshield. Trying to work the windshield washer I found it to not be working, and just dealt with the bugs collecting.
When I got home I filled up the washer reservoir and found it still not working. I followed the hoses and they went around to the drivers side where there's an electric valve. I pulled the hose out of the valve on the pump side and fluid would flow, but when I pulled the hose out of the exit of the valve, nothing came out.
I did a search on the ih8mud forum and found that this is the diverter valve that determines based on your button presses, whether the fluid goes to the windshield or the rear window. Seems that these crud up on the inside after a while and aren't worth trying to repair and should just be replaced. Some folks will just replace them with a T fitting and just let the fluid flow to both. I looked up the part number and found a brand new one on ebay for $40 and ordered it up. Got the new one in and all swapped out.