My Whirlpool dryer will run and heat for 20 minutes and stop running. If I wait 15 to 20 minutes it will start back up and run another 20 minutes and stop again. If I wait another 20 minutes it will start back up and finish the load. I checked the vent for blockage and looks good, plenty of airflow as well. I check the Hi T-Stat for continuity right after it stops and it appears to be closed or have zero resistance. The internal bias T-Stat also shows continuity. What switch will stop the motor from running until it cools down???? I haven't seen the wire diagram yet but I haven't opened the top panel so it might be there. Is there a wire diagram for this model on line somewhere?

Thanks for the reply ThatGuy,
Is this a common problem? The unit isn't very old and the motor sounds fine right up to when it stops. When I pull the clothes out after they have gone through 2 or three of these cycles they are very hot. I feel like everything is getting to a heat trip point that shuts the dryer down. I can see the heat coil cycle and it (the coil) turns completely off about 10 seconds before the motor stops.