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midyearallyear - yes, the small plastic cap is for washer fluid.
The two bands in fender well are there to hold an overflow hose that you’re missing. It connects underneath.
Under the gas cap flap you will notice a small hole for any washer fluid, rainwater or gasoline etc. overflow. Periodically keep the drain clean.
As for wiper pump not operating first make sure it’s connected. Insure it’s getting power, set up a couple lines and a water bottle to test function of pump. I was able to clean and rebuild my pump. Secondly it’s likely the T-connectors/ check valves and/or spray nozzles are clogged.
True, late model SC with factory ac had a dryer mounted inside left fender.
