If your central air conditioner does not seem to be cooling your home as efficiently as it has in the past, there is a possibility that the fan has started malfunctioning. If you suspect this could be the case, look for the following signs that your AC unit's fan is failing.
Humming Noise Is Heard
While your air conditioner is running, stand next to it, and listen closely. If you hear a loud humming or buzzing sound, this noise could indicate a problem with the fan.
If the bearings inside the fan's base have worn down, they are no longer able to smoothly rub together. The friction caused by the rough edges will produce a humming noise. If left unrepaired, the bearings will wear down more quickly, and the fan will eventually stop rotating.
Smell of Burning Rubber Is Detected
After listening for any strange sounds coming from your air conditioning unit, go inside while it is still running. Take a deep breath in, and see if you detect the smell of burning rubber.
If you do detect the odor, it could be a sign that the fan's belt is frayed or loose. Because it is no longer able to pull the fan evenly, the rubber from which it is made will rub against the fan's post.
The friction created by the belt and the fan will increase, and the heat will warm up the rubber to the point that it will start smoking a little bit. This smoking will then create the odor you are smelling.
While you may be tempted to simply change the belt yourself, the odor could also be caused by the compressor failing. Have a professional HVAC professional inspect the unit to ensure the proper part is repaired.
Air Flow Is Greatly Reduced
Another sign that your AC unit's fan is failing is when you notice that the air flow through the vents is greatly reduced. The air will most likely still be cool, but it is not being forced through the system strongly enough.
If this happens, the excess cold air could become trapped, making the unit's internal temperature drop. The air conditioner's compressor will then constantly freeze up until the fan is repaired.
If you find that your air conditioner is exhibiting any of the above behaviors, its fan may be failing. Contact an air conditioning repair service, like Doctor Fix-It, so they can send out a contractor to diagnose the issue and discuss your options for repairing the unit.