I have a 'fridge in the garage. Lately I've noticed that the freezer is not keeping the food in the freezer section frozen. The 'fridge has been working properly before this last cold snap. It seems that I once heard that the 'fridge has some sensor that determines the outside temp and that at some low outside temp it won't run. Thus, the freezer won't keep the food frozen. Is this correct? If so, what can I do to make the 'fridge run to keep the freezer section cold enough?