The answer to 'evaporator coil making noise' is that there are several common causes, including a malfunctioning blower motor, refrigerant leaks, or a problem with the coil itself. Symptoms may include unusual noises like buzzing, humming, or rattling coming from the indoor unit. Solutions can range from simple DIY fixes to more complex professional repairs, depending on the root cause.
If the noise is coming from the blower motor, it may need to be cleaned or replaced. Refrigerant leaks can cause the coil to ice over, leading to abnormal sounds. And issues with the coil, such as damage or debris buildup, can also create noises. In many cases, it's best to have a licensed HVAC technician diagnose and repair the problem to ensure it's fixed properly and safely.