Product review (5 stars): Cold control 2198202 from partshouse
First, let me say that Partshouse was great.  I ordered the part on Thursday, and it was delivered on Monday with standard shipping.  The control fixed the problem with my refrigerator getting too warm.  The part was exactly as described, and even had the plastic sleeve already installed.

I watched the Youtube video on how to replace the control for my model of Whirlpool refrigerator and everything went as shown.  I agree with many of the prior comments that the control needs to be set around "1" (warmer setting) and that the adjustment screw needed a little more that a third of a turn clockwise.  Now the refrigerator runs like new and keeps the temperature just about perfect.