What burns out an AC compressor?

Author: Madilyn Jaskolski  |  Last update: Wednesday, August 6, 2025

While their primary job is to raise the pressure and temperature of the refrigerant, compressors can burn out if they get too hot. Overheating, in fact, is one of the leading causes of compressor burnout. Most compressors are lubricated with oil. If they get too hot, the oil will burn off.

What damages an AC compressor?

High voltages can also damage the motor causing the compressor to overheat. Moreover, dirty coils, low refrigerant levels, and lack of insulation; all can contribute to compressor overheating, ultimately resulting in compressor failure.

What makes an AC compressor go out?

The AC system requires a specific amount of refrigerant to function properly. If the level is too low, it can cause the compressor to fail prematurely. The compressor may be failing because of low refrigerant levels or air in the system, which causes friction inside the compressor.

What is the most likely cause of compressor burnout?

Compressor burnout is a very specific mode of failure that may be caused by high temperatures in the motor windings or discharge area of the compressor. High temperatures break down the motor winding insulation, which may cause a loss of electrical resistance and result in a short to the ground or even an open winding.

What is the number one cause of compressor failure?

1. Too Little or Too Much Refrigerant. In the event that the amount of refrigerant in the system is not perfect, it could create too much pressure or strain and lead to compressor failure. Too little refrigerant is most likely caused by an insufficient charge from the last technician, or from a refrigerant leak.

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How long do AC compressors last?

Most compressors have the same or similar life expectancies as traditional AC units. They typically break down after 15 years but can last longer with proper maintenance. Many people believe replacing their air conditioner's compressor is more cost-effective once it gives out.

What are the 3 major common electrical failures of compressors?

Among the various challenges compressors face, three electrical failures occur most frequently: short circuits, voltage imbalance, and motor overheating. These issues are often interlinked, arising from factors like poor maintenance, environmental exposure, or ageing components.

Can you burn out an AC compressor?

Compressor burnout is certainly something you never want to happen to your air conditioner, so our short answer is going to be a resounding, “yes!”

Why does my brand new AC compressor go bad?

Some of the most common reasons AC compressors stop working include: Dirty condenser coils. Blocked suction lines. Low refrigerant charge.

How do you know if your AC compressor is burnt out?

Not Blowing Cold Air – The first sign of a bad compressor is typically warm air coming from the vents in your home. This is because the compressor's main job is to turn the refrigerant from a liquid to a gas.

Why would AC compressor fail?

Dirt and dust prevent the expulsion of hot air, forcing the AC to constantly run throughout the day to provide enough cool air in your space. The increased pressure and heat that gets trapped in the system overheat the compressor and makes it eventually fail.

What is the life expectancy of a car AC compressor?

A compressor should last about 10 to 15 years but may have a reduced lifespan if you use your air conditioning system frequently. If your air compressor is going bad, you need to take your vehicle to an auto repair shop to have it replaced.

How much does it cost to replace an AC compressor?

On average, AC compressor costs range from $800 to $2,300, with most folks paying $1,200 for a new one. However, your price will vary depending on factors like the size and brand of your compressor. Before you schedule your replacement, read on to learn about all AC compressor cost factors.

Can I run my AC with a broken compressor?

The compressor is a vital part of your AC unit, responsible for compressing the refrigerant and circulating it through the system. When it fails, your cooling system can't function properly, and you'll be left in an uncomfortable, hot home. When your compressor dies, it often means the AC must be fully replaced.

Can a power surge damage an AC compressor?

A surge in voltage can overload the system, damaging circuit boards, AC or heat pump compressors, motors, wires, capacitors, and other crucial parts. If your air conditioner or heat pump stopped working after a power surge or is not blowing cold air, the surge has likely caused internal damage to your AC.

What needs to be replaced when AC compressor goes bad?

This is the big overhaul: professionals not only replace the evaporator coil and the condenser, but they also put in a new blower and heating system. This is the most expensive choice, but in the right circumstances it can be the most convenient and cost-effective.

How long should an AC compressor last?

Compressors are actually very dependable (lasting on average between 12-15 years) so typically, when your AC compressor has gone bad there's an underlying cause that needs to be addressed lest the problem reemerge even after the unit has been replaced.

How to make AC compressor fail?

What causes HVAC compressor failure?
  1. Electrical failure. ...
  2. Blockage of condenser coils. ...
  3. Compressor overheating. ...
  4. Evaporator motor displacement. ...
  5. Low refrigerant levels. ...
  6. High refrigerant levels. ...
  7. A lack of lubrication. ...
  8. Dirt and debris stuck in the outdoor unit.

Is it worth replacing compressor on AC unit?

The warranty, type of compressor, unit size, refrigerant type, brand, and season all impact a compressor's replacement cost. If your AC is over nine years old, replacing the unit is usually more economical. You might want to replace only the compressor if it's under six years old.

What burns out a compressor?

Things such as moisture, non-condensables and overheating are preventable causes of motor burn out. Proper evacuation and charging coupled with proper system maintenance (replacing the filter, cleaning condensers, and properly adjusted controls) will prevent many burnouts from occurring.

Can a dirty filter cause a compressor not to work?

Potentially, yes. While there are a whole host of issues that could cause problems with your air conditioning system, a dirty air filter should be the first thing to check if your central air conditioning unit isn't working as properly as it should.

Can overheating damage AC compressor?

Your AC won't suffer catastrophic damage if it overheats just a little bit. However, the compressor may fail if the AC overheats for a long time or hits dangerous temperatures.

Can an AC compressor get clogged?

Refrigerant blockage: This less common problem can happen because of a pinched or damaged AC line or hose. It can also be related to a defective expansion valve or clogged orifice tube.

What does a slugging compressor sound like?

The first sign of liquid slugging is a loud knocking noise coming from the compressor. But because HVAC/R systems appear to be functioning normally, slugging may not be noticed immediately. If a compressor continues to run with this problem, extremely high pressures will develop in the cylinder.

Can a bad AC compressor cause other problems?

Your AC system may leak refrigerant due to a faulty compressor. Numerous connections and seals on the compressor may eventually leak. In addition to causing the refrigerant to leak out of the system, a damaged compressor can harm other parts of your system and impair cooling performance.

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