How to Troubleshoot & Replace Whirlpool AP6007590 / WP31001192 Cycling Thermostat (Control), Single

Ultimately, the cycling thermostat appeared to be causing the problem. Although testing it did not reveal any issues, replacing it resolved the problem. I had tried the high limit thermostat which did not resolve the overheating issue. While I was at it, I replaced the heating element as it was showing its age (dryer is about 25 years old) but it tested OK. Wife satisfaction factor is highly increased now! 

Replaced the belt and heater element because they were worn, but still functioning. Replaced the thermal fuse by the heater element because it was showing open on a meter. Replaced the tstat cycle because it was working improperly. Everything except for the thermal fuse tested properly for continuity. I imagine that the t stat cycle was not shutting off when it was supposed to causing the heater element to keep getting hotter even when desired heat was reached. This caused the thermal fuse to pop open. 

I replaced the thermal shutoff, and two other thermostats-one in the heater plenum and the other near the fan vent. No dice. I think now it might be the motor thermal shutoff and the motor is going bad. Onward! 

Replaced the cycling thermostat. 

Installed a heating element kit. The parts were oem [maytag] not china