The other day I noticed that the load of clothes was taking forever to dry. I opened the dryer door and everything was cool to the touch. I will try to show you how I troubleshot this problem. Hopefully it will be informative. This was a Kenmoor series 90 dryer.
Step 1: Unplug the dryer
First pull the dryer out away from the wall and as with all things electrical, unplug it!