No, replacing parts blindly usually is a recipe for spending unnecessary money. If you don't know how to do electrical troubleshooting, just call a repairman. One thing you could do is make certain that the dryer vent is clean and clear of obstructions. Also, if you use dryer sheets, is your lint screen clogged? If you put water on it and it beads up and doesn't go through, you could have cut the airflow enough to overheat it. If the thermal limit actually tripped out, there is a reason and that has to be fixed or you will repeat the whole problem.
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