Window Wiper Fluid only works on passenger side. Mystery hole on driver side...

Osteomata said:

... there is a hole in the bottom of the three way connector on the driver side. Only thing is this whole looks intentional, like that is the way the three way connector is designed.

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The hole is intentional. It's an air hole. It allows the rubber diaphram inside the check valve to move freely. The driver side three way connector is both a T-connector and a check valve. The passenger side is just an elbow and a check valve. The valve allows fluid to flow in one direction, and blocks air and mold from getting into the lines in the other direction.

I can't figure out how the fluid on the driver side is effected, but the downstream passenger side is just fine.

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Fluid is passing through the connector to the passenger side, but the short line up to the driver side nozzle is plugged, or the check valve is not working right.

I clean the jets, but I replace the check valves when they start going bad (for $2-3 each online). You can also try cleaning the valves or replacing the rubber diaphrams with a new piece of latex.

The check valve consists of a small disc of latex rubber with a plastic piston and a small spring inside a barrel which snaps together. There are the two check valves for the windshield, one more behind the bumper for the headlight washers, and one inside the driver side fender for the rear wiper washer. The pic below is the 3-way valve on the driver side.