Windshield washer not working?

Perhaps fuse block was replaced and was not the correct replacement for the specific model and year of S10. Or the fuse block cover w/ diagram was just replaced and is not the correct diagram for the vehicle. Which fuse number spot and which fuse block are you talking about?

Okay, that spot is not used so that is why it's like that. The only fuse associated with the washer is the same fuse used for the wipers which is labeled FRT WPR 25 amp in the interior fuse panel.

Yr owners manual should have the location of the fuse. If you wanna check the pump. Have some one activate it while you check it with a test light. Im just wondering, how cold is it there. It may be frozen up

Hello and thanks for donating

Intermittent conditions are always the toughest to repair. In this case, it is actualy relatively simple. You can rule out wiring pretty easily here because if it were grounding out than they would come on even when the switch wasn't activated or they just wouldn't work at all and blow the circuit fuse. The only thing left on the circuit for wipers that include both washer and wiper functions are the wiper switch on the dash and the wiper motor module. In this case, the wiper motor module is the most likely culprit because if the switch were to be faulty than it wouldn't effect the wipers when the washer button was pressed because the washer part of the switch has a different wiring to it. Replacement of the wiper module is suggested. I have attached a copy of the wire diagram for wiper system below..