What happens if I don't replace my A/C compressor?

Whenever I start the car, the A/C compressor makes a lot of noise. It's so expensive to replace so I'm wondering if the car will be ruined if I just don't replace it.
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Thank you all
I know someone who is a retired mechanic; hopefully they would help with diagnosing the problem.
I just get nervous when I look up replacement and it's like 25% value of the car
What happens if I don't replace my A/C compressor?
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