My freezer is over freezing and my fridge is undercooling. there is also water collecting on the top shelve of my fridge.

Hello, this sounds like you have a blockage in the drain tube, remove panel back of freezer..you may see ice build up...melt ice with hair dryer/heat gun...you will see a pan below evaporator...melt ice in pan...dry water up in pan with paper towel...now you should see a hole in pan that leads to drain tube...pour some hot water in pan..wait a couple minutes..mop up water and repeat this step 2-3 times....once you have done this find some flexible curatain wire or electrical wire..poke down the hole until you see the water drain..now it is clear..put back panel back and you are good to go. The reason you see water in the Freezer is because the water has been leaking into the freezer instead of running into the drain hole...If you need any further assistance please feel free to comment again. good luck! P.s Please don't forget to rate my solution thanks! Mike.