Dryer not heating, but motor running

I first unplugged the dryer and pulled it away from the wall. I had to remove the vent tubing to gain access to the rear of the unit, then removed the screws on the back panel of the dryer. I took off the panel and noticed that lint that had gathered over the years around the back of the dryer. I vacuumed it clean then proceeded to problem solve. I noticed four easily identifiable areas, the thermal cut-off switch and thermostat located by the heating coil and the thermostat and fuse near the venting area. I first checked the fuse with a ohm meter, it was okay. I removed each component one at a time and created a bypass with a alligator clip wire. Plugged the dryer back in to determine if heat was produced while testing each area one at a time. I determined that heat was produced after bypassing the thermal cut-off switch. I then ordered the thermal cut-off switch kit (arrived within 3 days) and installed it within 20 minutes. The longest time spent was trouble shooting, the removal and installation was very easy. By the way, I did use the ohm meter to check the resistance across the thermostats as indicated in previous postings, but I found the results and technique to be more confusing. A bypass worked the best for me and much more reliable. The heat started immediately. I highly recommend downloading the schematics of your unit for part number and location identification.