My moms Montgomery Wards energy saver fridge, freezer causes our ice cream to melt and has caused some spoilage. But it freezes ice cubes after about 12 hours. 1st. though I am not tech suavy I am thinking it is not getting cold enough. So what type of thermometer would I need to get that could be put in the freezer to see what temp it really is. 2nd. what can be done and how do you clean these coils I have been hearing about in some other posts? And where are they? There is no money to replace so I am hoping there is something I can do to fix the problem.