First start by turning off the power to
the air handler.
Next locate your blower motor door.
Remove the screws from the door.
Then remove the door.
After that remove the belt.
Pull the belt out towards you
to remove it off the squirrel cage Pulley.
When pulling off the belt.
Make sure keep your hands away from the pulley.
Or you will pinch your hands.
Now you are ready to install the new belt.
Start by putting one end of the belt
on the blower motor pulley.
Then put the other end
on the squirrel cage pulley.
See blower motor and squirrel cage.
Be very careful once again
not to get your hands in the pulley.
Or you could get hurt.
It is also a good idea to check running load amps
of the blower motor to make sure it is running.
Within the specified amps of the motor amp rating.