Product review (5 stars): Easy Fix
Freezer would get frosted over preventing air from flowing to refrigerator, couldn't figure out the problem.  Paid $100 for someone from Sears to come out and tell me in 30 seconds I needed to replace this part.  They wanted to charge $115 for the part and over $200 to install it.  I said no thanks, ordered this and installed it myself in less than 10 minutes.  Fridge works great now.  Plenty of videos on youtube that will show you how to do it.  One thing you need to know is the code to program it, it's listed right below your model # on the sticker inside your fridge... if you don't have that code you're in trouble.