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Intermittent rattling noise from the front passenger side when AC/heat is on?

Tiny
SANDEEPS
  • MEMBER
  • 2019 HONDA CRV
  • 1.4L
  • 4 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 32,000 MILES
While driving, especially after around 15 minutes with the A/C on, I've noticed an intermittent rattling noise from the front passenger side. The noise is not consistently present but occurs under specific conditions. It may be associated with the HVAC system or related components. I've observed that the noise doesn't occur when the vehicle is parked or during short drives. I would appreciate a thorough inspection to identify and address the issue. The noise sounds like the clutch cycling on the A/C compressor. Please kindly suggest what could be the root cause

The vehicle listed above is a Touring model.
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Tuesday, December 19th, 2023 AT 3:21 PM

10 Replies

Tiny
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Hi,

I do hear it. However, it doesn't sound like a rattle to me. Instead, it sounds like the A/C compressor is working. Does it appear that is where the noise is coming from?

Let me know.

Joe
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Tuesday, December 19th, 2023 AT 9:09 PM
Tiny
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Hi Joe, thank you for your response. Yes, it is from the A/C compressor somewhere.
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Tuesday, December 19th, 2023 AT 9:16 PM
Tiny
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But I have not heard this kind of sound before.
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Tuesday, December 19th, 2023 AT 9:17 PM
Tiny
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Is the temperature outside cooler or warmer than normal? Temperature causes pressures to change in the system.

Joe
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Tuesday, December 19th, 2023 AT 9:30 PM
Tiny
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Yes, it is much cooler like -2C.
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Tuesday, December 19th, 2023 AT 9:31 PM
Tiny
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Is it the clutch cycling on the A/C compressor?
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Tuesday, December 19th, 2023 AT 9:31 PM
Tiny
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Hi,

I don't think the clutch is making the noise, but chances are when it engages, that is when you are hearing it. To me, it sounds like a mount bushing or something maybe getting a little worn and allowing it to slightly vibrate. It's hard to be sure not being there, but that is what I'm thinking.

At this point, I wouldn't be overly concerned. It may be one of the things that we need to wait until it gets a little worse before we can identify the source.

Let me know.

Joe
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Wednesday, December 20th, 2023 AT 9:17 PM
Tiny
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Thank you Joe, I brought the vehicle to the Honda dealership, but they couldn't replicate the issue. I noticed that the sound occurs only in extremely cold temperatures, around -2 degrees Celsius. However, during their inspection at the dealership, the weather wasn't as cold. They informed me that they replaced the A/C compressor shaft and identified a leak in the shaft. I'm uncertain if this will resolve the problem.
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Monday, December 25th, 2023 AT 11:25 PM
Tiny
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Hi,

Thanks for the update. I have a feeling that will resolve the issue. If you have a chance, let me know. Also, I hope you had a nice Christmas. I can't believe it's over already.

Take care of yourself and remember, you are always free to come back.

Joe
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Tuesday, December 26th, 2023 AT 9:21 PM
Tiny
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Thank you so much! Wish you very happy new year. Yes I think this fixed this noise I no longer hear that noise any more after dealership replaced the compressor shaft.
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Sunday, December 31st, 2023 AT 10:28 AM

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