In addition to a grinding or banging sound, this issue can cause severe damage to other system components. When the fan blades are not perfectly aligned, these metal pieces can hit or grind against other metal components inside the condenser unit as the fan turns. It’s possible for a grinding noise to occur in your outdoor air conditioning unit if the condenser fan has a damaged or broken blade. If the bearings inside the motor are worn down, it may be possible to replace the bearings only, but this is often a sign that the entire motor is wearing out and should be replaced. If your air conditioner has not received a maintenance tune up recently, the bearings may just need to be oiled to eliminate the noise. If the bearings in your condenser fan motor produce a grinding noise, schedule an air conditioning repair appointment to correct this issue. It can be difficult for homeowners to differentiate between the two issues by sound alone. While this isn’t a true AC compressor grinding noise as the noise doesn’t originate from the compressor, bad condenser fan motor bearings can easily be mistaken for an AC compressor grinding noise as both components are housed in the outdoor unit. Bearings inside the motor can suffer damage from wear over time, and the motor will make a grinding noise as it runs due to the metal bearings rubbing against the metal motor housing. The outdoor condensing unit contains a condenser fan and motor which run to cool refrigerant within the condenser coil. In certain situations, such as with an older air conditioning unit, it may be preferable to skip compressor replacement and have a whole new air conditioner installed. If your air conditioner does need a new compressor, you should consider if making this repair makes the most financial sense. Compressor replacement is typically one of the most expensive air conditioner repairs, costing between $1,800 and $2,800 on average, without warranty coverage. If your compressor is causing this grinding noise, the entire compressor will need to be replaced. As the compressor wears out, the pistons start to produce a grinding noise when your air conditioner runs. The compressor’s pistons function to compress refrigerant gas before it is sent to the condenser coils to release heat. One of the most common causes of an AC compressor grinding noise is worn-out pistons in the compressor. If you hear grinding noises coming from the outdoor unit, these malfunctions may be why: 1. When you hear unusual noises from your home’s HVAC equipment, be sure to listen and see if the sound is coming from components inside or outside of the house. The compressor is located within the outdoor condensing unit of your air conditioning system. Causes of an Air Conditioner Making Grinding Noises Star Heating & Cooling explains the possible issues causing your AC compressor to make grinding noises and what you need to do if you hear this sound from your system. If you happen to hear a grinding noise coming from your AC compressor, this sound indicates malfunctions that need to be repaired. A steady hum from the outdoor air conditioning unit is all you should hear as your cooling system runs this summer.
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