Q: Air conditioner not turning on

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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.

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