Older Kenmore side by side has a few questionable sounds.. I need help!!
#1 Noise coming from the back , and popping sound occasionally too. Also Im having trouble with my vegetables always freezing and have lowered temp and closed the cold/colder slide thing @ the bottom but it still will freeze vegetables . It only happens every so often. What does this mean? 
Remove the back bottom cover and try to pinpoint the noises. Post the results.
About freezing vegetables - keep them on the lower shelfs and adjust the temperature warmer (in the freezer too).
It is always a good idea to control the both compartments, using a mercury refrigerator thermometers. Keep in mind that you have to wait about 24 hours after any adjustments to see the result.
Gene.