If you are experiencing repeated resistor pack failure the issue is not neccessarily the blower motor. Assuming the blower starts instantly when switched on and spins freely without unusual noises you should be looking for a blockage in airflow. The resistor pack incorporates a thermal fuse. When the airflow is not sufficient, then the thermal fuse will fail.
Airflow from the dash vents on med high or high should be very strong when working properly. On high you should be able to feel air flow in the second seating row.
To check for obstructions and inspect the fan you can either remove the blower motor or remove the right fender. Set the climate control to a fresh air selection to open the fresh air door. I pulled a large plastic bag and a lot of leaves out of mine. Assuming this ductwork is clear, next open the heater/evaporator box a little and inspect the face of the evaporator for debris. You can also peer inside through the hole for the resister pack. All airflow: heat, fresh air, ac, everything! must pass through the evaporator. If it's clogged the system will not have adequate airflow and the thermal fuse in the resistor pack will burn up.
Last edited by blackvan; 07-21-2012 at 06:32 PM.