Product review (5 stars): Exactly what I needed, and for a great price
When my 14-year-old Maytag refrigerator appeared to stop cooling, I knew by experience to look to see if the coils in the freezer compartment were iced.  In this instance, they were so caked with ice such that no air could circulate through the system.  Without air circulating through these coils, the refrigerator will to fail to cool.  Typically you will notice a change in the cooling quality over a period of a few days, as this doesn't happen overnight.  Using a hair dryer I was able to thaw this ice and get the system running again temporarily.
I know from experience that frozen coils like this usually mean that the defrost unit has failed, and it's been my experience that these defrost heaters are typically the point of failure.  I immediately looked up the part number online, then searched for the part on several sites, including Amazon.  I was able to get this replacement part for far less from Amazon than any other retailer, and as a Prime member, to get it overnight for $4.  The part arrived overnight, as promised, and it took me 15 minutes to install the part.  Installation involved removing the back panel in the freezer (4 screws,) disconnecting one power plug, unclipping the thermostat from the refrigerant line, and removing the failed heater unit.  Replacement involves performing the process in reverse with the replacement part. For about $40 I was able to perform a repair that had cost me over $200 on a similar refrigerator 13 years ago when I called for a repair.  The refrigerator is working great. I saved a lot of money, performed the repair myself the next day and without a lot of effort.  Thank you Amazon for making items like this available to us "handy folks" who want to resolve their own problems when possible!