There is a ticking noise and whistle noise from engine?

Tiny
SKOOTER28
  • MEMBER
  • 2021 DODGE DURANGO
  • 3.6L
  • V6
  • AUTOMATIC
  • 50,000 MILES
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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Saturday, April 19th, 2025 AT 8:11 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,663 POSTS
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.
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Monday, April 21st, 2025 AT 10:48 AM
Tiny
SKOOTER28
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  • 93 POSTS
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?
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Monday, April 21st, 2025 AT 12:02 PM
Tiny
KEN L
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  • 51,663 POSTS
Yep, that is what it sounds like, the ticking is not normal. Can you see where the A/C compressor pulley is discolored?
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Tuesday, April 22nd, 2025 AT 10:28 AM
Tiny
SKOOTER28
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  • 93 POSTS
Looking for hot spots.
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Tuesday, April 22nd, 2025 AT 10:29 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,663 POSTS
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.
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Tuesday, April 22nd, 2025 AT 11:11 AM

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