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How to Measure Whether a Compressor is Good or Bad?

2 Answers

McKinsley

08/29/25 6:42am

To determine the quality of a compressor, it's essential to identify the three terminals on the air conditioning compressor, which are S, R, and C. Here, S stands for the start winding, R for the run winding, and C for the common terminal. Use a multimeter to measure the resistance values. The sum of the resistances between SC and RC should equal the resistance between RS, which indicates normal operation. Below is additional information: 1. Function of the Compressor: The compressor's role is to regulate the start-stop state of the air compressor. By adjusting the pressure inside the air storage tank, it allows the air compressor to shut down for rest, which benefits engine maintenance. 2. Types of Compressors: Compressor types include swash plate compressors, vane compressors, scroll compressors, and reciprocating (crankshaft-connecting rod) compressors.

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DanielRose

09/11/25 4:20am

Here are a few practical methods I use to check the condition of an air conditioning compressor. After starting the car and turning on the AC, feel the temperature at the air vents. If it remains warm or doesn't cool down after a few minutes, the compressor might be faulty. Also, pop the hood and listen to the sound when the compressor starts—normal operation should produce a slight humming noise. If you hear knocking or sharp noises, internal components may be worn. Next, connect a pressure gauge to the high and low-pressure lines of the AC system. Normal pressure ranges are 150-250 psi for the high side and 30-40 psi for the low side. If the pressure is too low or fluctuates significantly, it could indicate a compressor or system leak. Additionally, check if the compressor belt is loose or cracked, as excessive looseness can reduce drive efficiency. Measuring current consumption is another simple method—use a multimeter to check the input current at the compressor relay. If it exceeds 10-15 amps, the motor may be overheating or seized. Compressor failures are often accompanied by oil or refrigerant leaks, so inspect the area around the compressor for oil stains. Ignoring these issues can lead to complete system failure, so I recommend checking the compressor oil level and pressure during regular maintenance to avoid costly repairs.

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