I have a kenmore 80 series dryer that won't get hot. It tumbles but does not get hot. I have taken out and tested the thermostats, thermal fuse, heating element, checked the breaker and the plug. Could it be the temperature setting switch or the timer? Thank you.

They are all in series, I would place probes on Element first and "walk the probes back to the open device.
If you have voltage across a thermal, it is open.