My symptom, front windshield washer works, rear one does not.
Ford uses a common pump for both front and rear washers. There are 2 hoses coming out of the pump, one to the front washers, the other to the back washers.
Front washer - 12 Volt powers the pump to pump water to front washer.
Rear washer - reverse the voltage to the pump, reversing pump direction to pump water to the rear washer nozzle.
I have removed the pump from inside the fender well. When I connect 12 Volts to it, pumps water out one discharge port. When I reverse the voltage (and therefore reverse pump direction) it pumps water out the other discharge port. When I put the pump back in, I can operate both washers supplying external 12 Volts and reversing the connection.
My problem is the pump operates to the front windshield, however, does not operate the rear washer. It does not operate, there is no voltage present and no clogs in the water line. I can blow air through the line and it bubbles in the washer tank.
I have changed the pump, the turn signal switch that activates the front/rear pump and the rear wiper. Fuses are good for both front and rear wipers.
Obviously a wiring problem since I have changed every component in the system.
Where to start looking?
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