Does the AC compressor need to be working for the car to work?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your mechanic says the AC compressor's condition affects the alternator belt because both components share the same belt system. If the AC compressor is seized or damaged, it can cause issues with the belt, impacting the alternator and overall performance. Technically, the car can run without the AC compressor functioning, but if the compressor is seized, it could prevent the belt from spinning other crucial components, like the alternator. So, replacing the compressor might be necessary if it's causing the belt to malfunction. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!