Rattling noise?

2004 DODGE DURANGO
141,000 MILES • 4.7L • 4WD • AUTOMATIC
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REALWOMAN4U2015
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When I turn on my AC I’m hearing rattling noise and truck was running loud while I was driving. When I turned it off, the noise went away and truck began to run normal afterwards. Not sure what’s going on.
Any idea as to what this could be?
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Jun 9, 2026 at 10:33 PM
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STRAILER
  • CAR REPAIR CONTRIBUTOR
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Yes, this sounds like the AC compressor is coming part internally, I would not run the AC anymore until the compressor is replaced. Here is a guide to help you change out the compressor step by step with a video to help you vacuum down and recharge the system with instructions in the images below to help you with your particular truck.

https://www.2carpros.com/articles/replace-air-conditioner-compressor/

and for the vacuum down and recharge.

https://www.youtube.com/watch?v=4EqdrBVb0sY

Make sure the system is empty before replacing the compressor and read the guides completely before beginning. Check out the images (below). Please let me know what happens.
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Jun 10, 2026 at 2:44 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.