i have a frigidaire dryer and the drum doesnt spin. there is good heat and all the switches worked. it was squealing when it was drying then it sopped squealing but i noticed that i didnt hear the drum spinning. usually during mid dry cycle i open the door and you can see the clothes fall from spinning but the clothes didnt move but there was heat. is my dryer drum run with a belt? or is there a motor that makes the drum spin.help