Q: Air conditioner not turning on

asked by on

The air conditioner in my car won't turn on.

Hello. The most common cause of a sudden AC failure is low refrigerant. Over time, the refrigerant leaks out and the system stops working once it is low enough. I typically start by checking the pressure in the system to see if it is low. If it is, I would add some and see if the system comes on. If it is empty, then that indicates a serious leak. I have also seen a series of issues with the AC switch itself failing, so if nothing else turns up, I test the switch with a voltage meter. If you need to have this done, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your AC issue and make the right repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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!
  1. Home
  2. Questions
  3. Air conditioner not turning on

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Oil leaking everywhere after Manifold replacement

Hi Vanessa. Thanks for contacting us today. This is not a common problem that happens after replacing an intake manifold. If they had problems with a bolt, it's likely that the manifold is not correctly torqued or secured - and...

Q: How to fix AC on a '95 Infiniti J30

Those Infinitis are electronic nightmares. All of that AC system is run by the computer. If you jump it and it works, watch my video. I even have a video "how to fix your AC system cheaply." Just get...

Q: Car won't start, sat for months

Hello. You are on the right track with testing the starter to see if it works. It is also possible that the battery has a bad cell in it and is not strong enough to start the car. I would...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...