How Long Does an AC Compressor Relay Last?

Your car’s air conditioning system needs to be able to pressurize refrigerant in order to operate. The AC compressor relay is an electronic component that turns your AC compressor off and on. Without it, the compressor will not work, no matter how good the other components are, because no electricity is being delivered to the compressor.

How long your AC compressor relay will last depends mainly on how often you use your air conditioning. The life of the compressor relay is measured in cycles, not miles – in other words, how many times it is turned on and off. Most are rated for about 50,000 cycles. For the typical driver, this usually translates to about ten years’ worth of driving. Of course, you have to keep in mind that the AC compressor relay is an electronic component, and as such, is vulnerable to damage from corrosion and dirt. If a lot of your driving takes place on dirt roads, or if you live in an area where salt and sand are used on the roads during the winter, you might have to replace the relay sooner.

Signs that your AC compressor relay needs to be replaced include:

  • Compressor fails to turn on
  • No cool air

Of course, this is not something that you need to deal with immediately, if you don’t mind living without air conditioning. However, if you are experiencing problems with the air conditioning in your car, an expert mechanic can provide a diagnosis, and if necessary, replace the AC compressor relay.


The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

How Can I Have the Vents Set to Cold Without the AC on?
The The modern automotive HVAC system offers a number of different capabilities to help keep drivers and passengers comfortable during hot or cold weather. There’s the air conditioning system, the heater, and the vent system (which doesn’t use either the...
What Causes the AC System to Leak?
Your car’s air conditioner is responsible for keeping the interior cool and comfortable on hot days. However, in order to do that,...
What Sensors in the AC Tell the Car If the System Is Working or Not?
The The average car today contains a bewildering range of sensors that feed information to various computers to monitor everything from air intake to emissions and engine timing. Your car’s air conditioning system also contains a couple of sensors that...

Related questions

How Does Climate Control Differ From Air Conditioning?

Climate control and air conditioning are terms that are very often used interchangeably. These two systems are related, but they are not the same. The climate control system is used to achieve and maintain a temperature inside a vehicle that...

Air conditioning not working on passenger side

Hello, this is a common problem on your vehicle. If the air conditioning seems to work fine at times and then suddenly blows hot, the problem is almost always the blend door actuator on the passenger side. This actuator moves...

temp is getting high while on traffic when ac is on

I'm not sure of your exact model, but most modern cars have an electric fan that comes on solely for the AC. Using the AC adds a tremendous amount of heat to the engine compartment. The fan is there for...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com