There are a few signs that can indicate a bad compressor:

1. The compressor is not running: If the compressor is not turning on at all, it could be a sign of a failed compressor.
2. Loud or unusual noises: If the compressor is making loud or unusual noises, it could indicate that the compressor is damaged or malfunctioning.
3. Leakage: If the compressor is leaking oil or refrigerant, it could indicate that the compressor is damaged.
4. No cool air: If the air conditioning unit is not producing cool air, it could be a sign that the compressor is not functioning properly.
5. High-pressure reading: If the high-pressure reading is too high, it can indicate that the compressor is malfunctioning and could be a sign of an internal failure.
6. Low-pressure reading: Similarly, if the low-pressure reading is too low, it can indicate that the compressor is malfunctioning and could be a sign of an internal failure.
7. Overheating: If the compressor is overheating, it can indicate that the compressor is malfunctioning.

It is important to note that these signs may also be caused by other problems in the system, such as a clogged filter, a malfunctioning thermostat, or a refrigerant leak, so it is best to consult with a professional to determine the cause of the problem.

How can I test my AC compressor?

Here are a few ways to test an air conditioning compressor:

1. Check the voltage: Use a multimeter to check the voltage at the compressor’s terminals. The reading should be within the range specified by the manufacturer.
2. Check the amperage: Use a multimeter to check the amperage at the compressor’s terminals. The reading should be within the range specified by the manufacturer.
3. Check the compressor’s windings: Use an ohmmeter to check the resistance of the compressor’s windings. The reading should be within the range specified by the manufacturer.
4. Check the compressor’s start and run capacitors: Use a multimeter to check the capacitance of the compressor’s start and run capacitors. The reading should be within the range specified by the manufacturer.
5. Check the compressor’s relay: Use a multimeter to check the continuity of the compressor’s relay. The reading should be within the range specified by the manufacturer.
6. Check for continuity: Use a multimeter to check for continuity between the compressor’s terminals. There should be continuity between the terminals.
7. Check for refrigerant leakage: check for refrigerant leakage from the compressor with a refrigerant leak detector.

It’s always recommended to consult with a professional to ensure safety, proper testing procedures and to correctly interpret the results. Some of the tests may require special equipment or knowledge to perform and interpret.

How do you diagnose a compressor failure?

Here are a few steps to diagnose a compressor failure:

1. Check the voltage: Use a multimeter to check the voltage at the compressor’s terminals. The reading should be within the range specified by the manufacturer.
2. Check the amperage: Use a multimeter to check the amperage at the compressor’s terminals. The reading should be within the range specified by the manufacturer.
3. Check the compressor’s windings: Use an ohmmeter to check the resistance of the compressor’s windings. The reading should be within the range specified by the manufacturer.
4. Check the compressor’s start and run capacitors: Use a multimeter to check the capacitance of the compressor’s start and run capacitors. The reading should be within the range specified by the manufacturer.
5. Check the compressor’s relay: Use a multimeter to check the continuity of the compressor’s relay. The reading should be within the range specified by the manufacturer.
6. Check for continuity: Use a multimeter to check for continuity between the compressor’s terminals. There should be continuity between the terminals.
7. Check for refrigerant leakage: check for refrigerant leakage from the compressor with a refrigerant leak detector.
8. Check oil level: Check the oil level in the compressor, if the oil level is low, it could indicate that the compressor is leaking oil.
9. Check the compressor’s pressure: Use a pressure gauge to check the pressure of the compressor. The pressure should be within the range specified by the manufacturer.
10. Check the compressor’s temperature: Use a thermometer to check the temperature of the compressor. The temperature should be within the range specified by the manufacturer.

It’s always recommended to consult with a professional to ensure safety, proper testing procedures and to correctly interpret the results. Some of the tests may require special equipment or knowledge to perform and interpret.