Product review (4 stars): Don't be intimidated. Save yourself thousands of dollars in repairs, buy this part and get your cool back again.
I almost got a new fridge until I realized my unit was all frozen up in the freezer section.

Come to find out that your defroster thermostat can go bad, resulting in the heating coils not knowing when to turn on and thereby resulting in the condenser coils getting locked up with frost.

Then get what happens? your machine runs and runs and doesn't get cold enough.

This was high quality and easy to replace. instructions are all over the internet and amazon has the best price.

If your fridge is having trouble keeping cold enough, look at the bottom of the freezer (side by side) and see if there is frost or ice. It could be your defroster.

My freezer was fine, but my fridge was not. I could feel slightly cold enough air flow into the fridge so I knew it wasn't the vent, so it had to be lower down. Air flow was blocked and condensers not getting cold enough, or good enough air flow into the fridge section.

I replaced this, used the wife's hair dryer to melt off the 2+ inches of frost on the coils and put everything back together.

This small little part saved me thousands of dollars!

I could then hear after the fridge turned back on that the defrost function was working when after a few hours and checking you can here it cycle on and you here a "sizzle" where the heater is melting the frost and it goes out the drain in the bottom (which incidentally make sure that is also clear of debris or it will keep too much moisture in your freezer)

happy customer.