Dryer overheats and blows thermal fuse. Thermostats have been replaced, element checks good and visually and with meter shows not being grounded. Vent is new and clear and only 6 ft. in length. Strong air flow from back of dryer.

It is a Inglis by whirlpool. Model # is 1EX3000RQ1. Hope this will help!

This dryer belongs to a friend that I was trying to help. I first encountered the upper thermostat was bad and I replaced it. The dryer ran, overheated in about 15 minutes and blew the thermal fuse. In checking I found that the cycling thermostat was not opening even though it had continuity, when heated it would click but still would not open and break the continuity. Here I thought was the smoking gun I was looking for. I ordered the high and low thermostats with come together as a kit, the cycling thermostat, and the thermal fuse. I have had the heat element out and ran continuity on it and also from each terminal to the housing and got no grounding. I visual checked the element as well but could see no breaks. If you run the dryer on the fluff cycle it does not heat up. I removed all the back housing to check for blockages of any kind and everything was completely clean. I put everything back together again and just new this time it was going to be right but after about 15 minutes it blew the thermal fuse again. None of the thermostats that I received were adjustable. The top one was part number 3977398 and the cycling one was part # 3977767 and the thermal fuse was 3392519. I do not have the number off the lower thermostat but that was has never blown. Hope this detail will help. Thanks,