The answer to 'AC making noise' is that there are several common causes, including worn-out parts, debris buildup, and issues with the compressor or fan. Symptoms may include grinding, squealing, or rattling noises, and the AC unit may not be cooling properly.
Some issues, like a loose part or debris in the system, may be fixable with DIY maintenance. However, more complex problems like compressor failure or refrigerant leaks often require a professional HVAC technician to diagnose and repair. It's important to address AC noises promptly to prevent further damage and ensure the system is running safely and efficiently.