My side by side refrigerator does not get cold and freezer not working properly, also to warm. I checked the thermostat for continuity. I even put one end of the bulb in Ice water and it did operate at different temperatures, it tested good. I replaced the overload and cleaned the coils underneath, they were very dirty. The compressor seems to go on, I put my hand on it and I feel it running yet it does not seem as loud as it was. It seems very quiet. The coils underneath do not get warm either. I wanted to know how to check the DEFROST TIMER BOARD. I am not sure that's it but before I buy that part I would like to be sure. I just spent $50.00 on an overload I did not need. Any help is greatly appreciated. Thank to all.