The ac will not turn on when the AC button is pressed

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I’m sorry to hear you're having trouble with your CLA250. When you press the A/C button and the light flashes then shuts off, that usually means the system is detecting a fault and preventing the compressor from engaging to protect itself. Common causes include low refrigerant, a faulty pressure sensor, or an issue with the A/C compressor clutch. It’s a good idea to have the system checked for refrigerant level and scanned for any stored HVAC fault codes. Even something like a blown fuse or a bad relay can cause this behavior. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!