When your AC makes strange noises, the required repair can vary based on the specific sound. Grinding or screeching suggests motor bearing issues or a failing belt, necessitating motor repairs or belt replacement. Rattling or banging could indicate loose parts or debris inside, requiring tightening or cleaning. Hissing noises often point to refrigerant leaks or ductwork problems, needing leak repair and refrigerant refill. Identifying the noise type is crucial for diagnosing the problem accurately, ensuring the correct repair is undertaken to restore optimal function.