Water Pump Problem or Blockage?

No flow of water - it heats the water and makes noise like it's attempting to pump the water, but nothing comes out. I partially disassembled, there no blockage at in the first 6 inches of the clear tube, or in the nozzle. When I blow into the tube, I am unable to move any air through the tube - seems like a blockage at the end of the tube near the water reservoir...I can't figure out how to get to the reservoir, though.