"Cold/Tap Cold"
Before I left THD and my appliance career, my three factory reps told me the same thing (MYT, GE, LG). "Cold" is tempered with the addition of warm water thru the valve to about 65F degrees to allow for correct dissolving of powdered detergent and additives. According to them, liquid treatments did not need this option. Where I live (SoFL), the tap water is usually warm enough to dissolve above-mentioned powders, even in winter. Also true for the SoWest USA. In NJ or its enviorns, "tap cold" is apt to be just short of freezading! Some newer models have a "cool" selection which accomplishes the same thing.