There is a ticking noise and whistle noise from engine?

2021 DODGE DURANGO
50,000 MILES • 3.6L • V6 • AUTOMATIC
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SKOOTER28
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I hear a ticking noise and whistle noise from engine. I’ve replaced the idler pully, the tensioner pully, and belt and still hear this whistle noise. Also the water pump has been replaced.
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Apr 19, 2025 at 8:11 PM
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STRAILER
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It sounds like the A/C compressor is going bad but do me a favor and remove the serpentine belt and start the engine for a second to see if the noise is gone, that way we can see if the noise is accessory related. Also, is there any discoloration at the A/C compressor pulley? If so, this is a sign the compressor is going bad. You might want to try turning the HVAC system off to see if anything changes.
Apr 21, 2025 at 10:48 AM
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SKOOTER28
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I think you're right cause the water pump went bad, and my gf thought the A/C compressor was making the noise the whole time. What about that ticking, is that normal?
Apr 21, 2025 at 12:02 PM
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STRAILER
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Yep, that is what it sounds like, the ticking is not normal. Can you see where the A/C compressor pulley is discolored?
Apr 22, 2025 at 10:28 AM
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SKOOTER28
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Looking for hot spots.
Apr 22, 2025 at 10:29 AM
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STRAILER
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If there are hot spots that is a good sign that the compression is bad. please go over this guide to help walk you through the steps:

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

And this video can help with the recharge:

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

Please go over these guides and get back to us.
Apr 22, 2025 at 11:11 AM