My fridge is not cooling and everything inside the top shelves of my freezer is thawing, but the bottom of the freezer is still cold and food is frozen solid. Same thing basically with the fridge, the top shelves are very warm, but the bottom feels colder.

I checked the back of the fridge and the fan is running fine. The black condessor thing is running, it is hot to the touch. I just recently replaced a part on it that was like a "plug" thing. Not really sure what that was. I also checked the coils under the fridge and vacuumed them out. I left it unplugged for the night.

Any ideas on what is wrong with it? Please help!!!