Thank you for submitting your question. I understand your concern and I will be happy to assist you. There are a few parts that aide the dryer in heating. You could be experiencing a issue with the thermal fuse (3392519), operating thermostat (3977767), high limit thermostat (3387134), thermal cut-off (279816), or the heating element (279838). You didn't state which thermostat you've replaced. I recommend testing the thermal fuse and the remaining parts listed above to make sure they're testing good. The timer advances the cycles but also has wiring connecting to the thermostats. So, the issue wouldn't be the timer itself but a faulty wiring. All the parts listed above, at room temperature should provide a reading of zero ohms, except for the heating element. You'll want to get a reading of 7.8 - 11.8 ohms for the heating element. The thermal cut-off and high limit thermostat work as a pair. So, if one of the two isn't working, replace both. If all the parts check out good, then you could be experiencing a wiring issue. However, I believe you'll find the issue after further testing. You can order parts from our
Sears Parts Direct
web site. I hope this helps. Please reply back to this thread if you require further assistance. Thank you for using Manage My Life.