Refrigerator has difficulty defrosting. I have defrosted it myself several times with a hair dryer blower. Purchased a "Defrost Timer Assy" hoping this would solve problem.. Can't find where the part is located. Thought it would be inside freezer, but looked and it wasn't here. Where is part located??

It is more than likely in the fridge. A lot of times the controls are behind the light fixture.

Thanks for input. I will check later when I get home.