What are the signs of a bad heater fan?

A worn or weakened blower motor may not be able to provide adequate airflow to properly regulate the cabin temperature, and may also be approaching the end of its service life. 2. Fan only blows at certain speeds Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds.

What does it mean when your AC fan doesn’t start?

When the fan doesn’t start even though the AC is turned on, it can be a clear sign that there’s a fault with the motor. When the AC runs without the fan circulating air, it can eventually lead to the evaporator coils freezing over. Once this happens, your air conditioning unit is at risk of suffering more serious damage.

Why does my heater fan only blow at certain speeds?

Fan only blows at certain speeds. If the blower motor fails to push air at any of it’s designed settings then it may be faulty. This can also be caused by a failed blower motor resistor or switch, so having the vehicle properly diagnosed is highly recommended.

What to do when your AC fan stops blowing air?

If your AC has stopped blowing air, has weak airflow, or you hear unusual noises, do a quick inspection of the fan motor. The motor is located in the condenser unit. Listen for a humming sound that tells you the AC compressor is functioning.

How can I tell if my AC Fan is overheating?

If you are near the condenser unit and it feels hotter than usual, it indicates that the fan motor may be overheating. HVAC technicians are equipped with an infrared temperature gun that can read the unit’s temperature without having to touch the hot surface. During winter your AC lies dormant.

When to lower the speed of the fan?

Conversely we use a lower fan speed during cooling season to increase the dehumidification or moisture removal in the building, and for night-time operation when the cooling load is reduced. The result is a more-quiet cooling system operation.