You can check to see if it's the line or just the dispenser by checking at the valve underneath the door. There is a plasic face that pops off and you will see where there is a white connector with blue seals on either side (it's small, the connector is just an inch long). You can take the water line tube off of that connector by compressing the blue sleeve into the connector and pulling the tube out at the same time. I usually disconnect from the right side, as the water comes from that side. Afterwards, get something to catch the water by placing the ends of the tubing into a bowl (they don't like to sit there, so you'll need to hold them in place) and pressing the water dispense lever. If water comes out of the left side, then the line is frozen somewhere after that connector. The tube runs up the outside wall of the freezer door. The easiest way that I've found to thaw it is to set a space heater/radiator next to that edge of the door. It should heat up the door enough to thaw the line inside of it inside of an hour or so. It is a total PITA, but is effective. Set your freezer temp to 2 degrees instead of the factory 0. That helps too. I feel your pain. I expected more from this model.
Answers & Comments
You can check to see if it's the line or just the dispenser by checking at the valve underneath the door. There is a plasic face that pops off and you will see where there is a white connector with blue seals on either side (it's small, the connector is just an inch long). You can take the water line tube off of that connector by compressing the blue sleeve into the connector and pulling the tube out at the same time. I usually disconnect from the right side, as the water comes from that side. Afterwards, get something to catch the water by placing the ends of the tubing into a bowl (they don't like to sit there, so you'll need to hold them in place) and pressing the water dispense lever. If water comes out of the left side, then the line is frozen somewhere after that connector. The tube runs up the outside wall of the freezer door. The easiest way that I've found to thaw it is to set a space heater/radiator next to that edge of the door. It should heat up the door enough to thaw the line inside of it inside of an hour or so. It is a total PITA, but is effective. Set your freezer temp to 2 degrees instead of the factory 0. That helps too. I feel your pain. I expected more from this model.
Correction. I meant to say that water should come out of the right tube.