What is one sign that the compressor may be worn out?

Unusual noises or high running temperatures are indeed signs that the compressor may be worn out. When a compressor begins to wear, it can create sounds that differ from its normal operation, such as grinding, screeching, or rattling. These noises are often indicative of internal damage or component failure.

Additionally, high running temperatures can suggest that the compressor is struggling to operate efficiently due to wear. As components inside the compressor become worn, they may not be able to compress the refrigerant as effectively, leading to increased strain and subsequently higher temperatures. Normal operation should not result in excessive heat, so a consistently high temperature can be a clear indicator of wear or deterioration.

In contrast, frequent short cycling might indicate other issues such as improper thermostat placement or a refrigerant leak, while low refrigerant levels can stem from leaks or poor system maintenance rather than directly from compressor wear. Constant running without stopping may suggest an issue with the thermostat or a refrigerant problem, but not specifically that the compressor is worn. Therefore, unusual noises and high temperatures are the strongest indicators of a worn-out compressor.