Why Is My Air Conditioner Making A Weird Noise?

When you begin to hear weird noises coming from your air conditioner, you can pretty much count on something being wrong with the unit. Instead of ignoring it and hoping it just goes away, it makes much more sense to have a qualified technician check out the situation and find whatever problem might be lurking there. 

In truth, there are a number of different strange sounds that an air conditioner might make, and if you can identify those sounds, you may be able to figure out what’s happening. Here are some of the more common weird noises your cooling system might make, and what you should do about them.

Squealing Sounds

When you hear a high-pitched squealing sound coming from your air conditioning unit, there are two likely causes for that noise. The first of these is that the belt which connects the motor to the blower is slipping, and the second one is that the bearings on the condenser fan motor are beginning to degrade. 


Many newer air-conditioners don’t even have a belt system, so if you have an old air conditioner installed, it’s more than likely going to be the belt that is the problem. If that is the case, all you have to do is get the belt replaced by your HVAC technician, and the noise should go away and your unit should be performing optimally again. With newer units, it’s more likely that the bearings are the culprit, and this too calls for intervention on the part of a qualified HVAC technician.

Buzzing Sounds

Any kind of loud buzzing noise coming from your air conditioner is a definite indication that there is an internal malfunction. This usually ends up being a malfunctioning compressor, refrigerant leaks, broken isolation feet, or parts that have been shaken loose on the interior. Whenever any part of your cooling system happens to shake loose, it puts a lot of stress on the other parts, and when that happens, it’s very possible for a buzzing sound to come from your air conditioning unit. 

The compressor unit for an air conditioner sits on rubber feet which are known as isolation feet, and these are installed at the foundation of the cooling system. Over a period of time, these feet can disintegrate or crack, causing the compressor to become unbalanced, which can result in a buzzing noise during operation. 

When refrigerant begins to leak from your A/C unit, it can cause the condenser coils to freeze up, and this will also generate a buzzing sound which is very noticeable. If your compressor is malfunctioning, it could mean that the electrical voltage is not right on your unit, or that the compressor itself is beginning to deteriorate. Either way, this will produce a buzzing noise which is very easy to detect in the household.

Banging Noises

This is almost always a sign that you have a broken part or a loose part on the interior of your cooling system. It might be a piston pin, a crankshaft, or a connecting rod, or it could be the case that your interior blower has become unbalanced for some reason. 

The worst-case scenario is probably that the strong banging noise is indicating that your compressor needs to be replaced. If you hear a banging noise coming from your air conditioning unit, you should contact your HVAC technician right away, so that the problem can be diagnosed and repaired as quickly as possible.

If you’re looking for heating and cooling services in Birmingham you can rely on, get in touch with the team at All Seasons Heating & Cooling today.