I have seen the heating element come on high , even when Air dry is selected, which should be NO HEAT! This is usually caused by a bad control board. The board located near the upper left hand side of the dryer on the older kenmore and whirpool models. This board is fairly expensive to replace, for myself here in Canada anyway. if you do replace it, make sure you get the proper replacement , as they all look the same but will not function in different dryers most of the time.