Some of the signs that indicate an air conditioner blower motor is malfunctioning include not feeling that the air temperature is comfortable when the air conditioner is on and running andhaving abnormally high utility bills. Hearing strange noises when the unit is running is another sign.
An air conditioner blower motor may be malfunctioning when there is inadequate airflow coming from the unit and the surrounding area temperature is not as cool as it should be. This can happen if the unit's filter needs to be changed or if there is an obstruction to the cold air return or registers in a home. An air conditioner blower motor that is running and produces no airflow may also be caused by a broken fan belt or one that has shifted out of place.
When the energy costs of using an air conditioner increase, it can indicate that an air conditioner blower motor is not operating efficiently. This can also be caused by a dirty filter that is in need of changing or coolant that needs to be recharged.
If an air conditioner blower motor makes abnormal noises, such as rattling, buzzing or ticking, it can indicate that the blower motor or fan blade needs to be replaced in the unit. Noise can also be caused by a loose screw that simply requires tightening or lubricating.