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My freinds F-150 had this problem also. It turns out there was a T-fitting inside the dash below the plastic that took a dump on him. It was spraying the fluid in there instead of out the nozzles. So have someone push the button for you and listen to see if it sprays, so that you can make sure its not the pump. Then look in the engine compartment to see if its spraying anywere. You will eventually find the problem. It may just be clogged.