You need to replace the sensor located in the back of the dryer by taking off the back.It's the temperature selecture.It's pretty much the thermostat to the heating coil.It's a small cheap part. If you want to find out if it's broken or not use a multi meter to find continuinity. There's four male legs on the sensor. The two small legs are the sensor for the heating coil which tells it what temperture to go to.If that's broken,your heating coil will not heat.My husband troubleshooted our Kenmore series 80 dryer. You are very welcome. :^)
Mareia & Brian Sexson, October 2007