Freezer And Fridge Is Only Cold At The Bottom

My FREEZER Is Warm At The Top And In The Middle. It Is Cold At The Bottom. The Refrigerator Is Warm At The Top And The Middle, And Cool At The Bottom. We Replaced The Thermostat But That Didn’t Work. We Replaced The Motor And That Didn’t Work Either. What Could Be The Problem? Also The Icemaker Is Not Working Either.
WE PLUGGED THE FAN MOTOR INTO THE WALL OUTLET AND IT RUNS CONTINOUSLY. WHEN IT WAS PUT BACK INTO THE FREEZER IT RAN FOR A FEW SECONDS AND STOPPED AGAIN. IT WOULD NOT START BACK. WE DON’T KNOW WHAT TO DO NOW. WE HAD A SERVICE TECHNICIAN COME OUT AND HE THOUGHT THE PROBLEM WAS THE CONTROL BOARD. WE BOUGHT ONE AND IT STILL DID NOT MAKE THE FRIDGE/FREEZER WORK.