The answer to 'AC repair making noise' is that there are several common causes, including worn or loose components, refrigerant leaks, and compressor issues. Symptoms may include grinding, squealing, or rattling noises coming from the outdoor unit. In many cases, these issues can be resolved with a professional HVAC service call, as they often require specialized tools and expertise to diagnose and repair properly.
However, some minor noises may be fixable with basic DIY troubleshooting and maintenance. For example, you can try lubricating moving parts, tightening loose screws or panels, or cleaning the condenser coils. But if the noise persists or seems to be getting worse, it's best to call in an HVAC technician to properly inspect and repair the system.