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When you activate the washer pump with the stalk button, does the pump make a high-pitched whine like it's running fast or is it a lower tone like the pump is running slow?
With the nozzles disconnected the pump can only supply volume and will not shoot out very hard. The pump uses the nozzles as a restriction to build pressure and then spray the glass.
If the pump is running slow then I suggest picking up a new unit and be done with it. I also recommend a new pair of washer nozzles.
Drop a flomax in the washer bottleForget the truck.
Wait until it happens to you.