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Why is my AC making a clunking noise?

While on my morning commute today I turned on the AC in my car as it’s getting hot where I live, but my AC started making this weird clunking noise. I turned it off and rolled my windows down instead, but with summer coming, I’d really like to get it fixed. Any idea why my AC is making a clunking noise?

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Katherine Duffy · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
We’re sorry to hear you’re having problems with your car’s AC. There’s nothing worse than no AC in hot weather!
Your AC might be making a clunking noise because of loose bolts that secure the unit inside your car. Loose bolts can cause parts of your AC to shake around and cause a clunking noise when the system is turned on.
If the clunking is loud and fast, it’s possible that there’s an issue with your compressor or serpentine belt. A damaged belt can cause strange noises but it’s a simple fix. A damaged compressor, on the other hand, is a very expensive fix.
Keep your AC unit off and bring your car to a mechanic so you don’t risk damaging another part of the unit. Your mechanic will correctly diagnose the problem so you can fix your AC unit and enjoy cool air again!
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