AC blower performs the task of pushing the cold air into the cabin compartment. In simple words, it manages the airflow from the AC in the car cabin. It needs repair or replacement when the air does not get blown at all or properly. However, improper blowing can also be due to the power connection issues in the blower motor resistor. It is why a proper check is necessary before replacing or repairing it. 

Some of the signs of the AC blower not functioning efficiently can be:

• Inefficient and weak airflow
• Abnormal noises
• Smoke and strange smell

Among the listed signs, if you notice even the slightest smoke and foul smell, it is advisable to stop driving or using the AC immediately and get it checked first.