Skip the auto shop - Our mechanics make house calls

How Long Does an AC Pressure Switch Last?

AC pressure switch

Your car’s AC system uses refrigerant to help keep you cool and comfortable in hot weather. When the refrigerant is under low pressure, it takes the form of a gas, and when it is under high pressure, it transforms into a liquid. So, your AC system works under both high pressure and low pressure, and needs to be able to switch between the two in order to work. This is where our AC pressure switch comes in. It is, essentially, a safety feature that “trips,” or turns the system off, if there are any problems with pressure in the system.

There are any number of things that can cause the switch to trip, and not all of them involve the switch itself. If the level of refrigerant is too low or too high, for example, the switch could actually read incorrectly, and shut off the system. Most of the time, problems that appear to be with the AC pressure switch are problems elsewhere in the AC system. The switch itself is very stable, and should last a very long time.

The life of an AC pressure switch is measured in cycles, not miles or years. You can expect to get 50,000 cycles out of your AC pressure switch, which means that unless you are constantly turning your AC on and off, it will probably last you the life of your car.

However, like all electronic components, the AC switch could (rarely) fail, and if it does, then:

  • The AC compressor will not come on
  • The air conditioning will not work

Of course your air conditioning is not vital to your car’s operation, but just the same, it is quite important when it comes to your comfort. If you suspect that your AC pressure switch is faulty, you should have it checked out. A professional mechanic can diagnose problems with your air conditioning system, and if needed, replace the AC pressure switch.

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

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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.


Post a question and get free advice from our certified mechanics.


More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...

Related questions

Q: What Causes Leaks in a Car's AC System?

Automotive air conditioning (AC) is a closed loop system comprised of four main mechanical parts: the compressor, condenser, evaporator, and depending on system design, receiver drier or accumulator. Refrigerant is circulated through these components with the refrigerant pressure and temperature...

Q: got exhaust replaced now power steering went out same day are they related?

Hi there. Doing the exhaust should not have anything to do with this. It sounds like a belt problem. If a belt came off or is loose then it will affect the steering and the AC. I would check...

Q: Rattling and screeching noise

Hello. The A/C compressor clutch and pulley should be checked and you should replace the pulley only if the compressor is not leaking. If it is, then replace the complete compressor assembly. If you would like to have this checked,...