Your vehicle’s heating, ventilation, and air conditioning (HVAC) system plays an important role in maintaining proper ventilation in the cabin, especially the blower motor. This part works with the fan switch to allow you to adjust the fan settings of your air conditioning (A/C) system to your liking. But like any other car part, it can wear out or become damaged over time. Symptoms of a bad blower motor are unusual noises and weak or no airflow.