The job of the blower wheel is to circulate the air through the dryer. It is coupled with the motor shaft, so when the motor runs, the blower runs with it.
So if the dryer is not drying properly, the problem could be the blower wheel.
If the threads in the blower get stripped or the vanes are broken. The blower wheel is not going to be able to do its intended job.
To see how to check & replace the blower wheel in a Whirlpool 27 inch electric dryer, view the video below
To see how to check & replace the blower wheel in a Performa electric dryer, view the video below
Below are the links to the parts needed for this repair.