I have a Kenmore series 70 gas dryer(model 110.74722400) and the dryer does not shut off when in auto-dry. It heats up well (replaced the coils and the timer), but just won't shut-off. We've been using the timer manual function and that works well. I've already cleaned out the lint from the exhaust. Is this a thermostat problem or thermal fuse or something else?

When it's in auto all it does is the heat comes on,reaches temp. then the heat shuts off,when the heats off then the timer advances,when the heat comes back on the timer stops.pop off the plastic cap on the left hand side of the front panel,put clothes in the dryer and run it,after 15 to 30 minutes look in the hole in the front panel and make sure the flame is still liting,also did you clean out the duct that the lint filter slides into.remove the vent line and if that's a long run blow it out with a leaf blower,i had one guy say his vent line was clear and he used a leaf blower and blew out a birds nest,then unplug the dryer,remove the back panel,on the left side take out the four screws and remove the duct and clean that out and the blower wheel,also remove the thermostat on the blower wheel housing and look at the back of it,if lint is stuck on it clean it off and put it back in and try that.also you said you changed out the gas coils,when you removed the out coils on the large coil there's a spacer that goes on the post and sometimes when you remove the coil it gets stuck inside the old coil or if after running the dryer for like 20 to 30 minutes and the flame doesn't lite you have bad gas coils,when they heat up they fail when they are going bad and that will stop the timer from advancing.let me know what you find and if i can help with any questions let me know