Hello. I've got an old Kenmore Elite electric dryer that heats up until it trips the non-resettable thermostat and then will no longer heat at all. I confirmed this much by finding the thermostat with broken continuity, replacing it (or rather, resetting it by slamming it into the ground), and then running the dryer again, at which point it heated normally for a few loads before quitting again. I cleaned out some dust when I opened the dryer up, but I assume I didn't fully address whatever was causing the overheating.
a. The lint trap is clean, and I can feel air blowing from the outside vent when the dryer is running (though I'm not an expert and don't know how to tell if the amount of air I'm feeling is enough air).
b. The heating element has continuity from one connector to the other, and not to the case, so it shouldn't be a short-circuiting element causing the overheating.
I'm in the process of taking the thing apart again. What could I be looking for to diagnose this?