Weird noise from engine when A/C turn knob is left on and then when turn car on in the Morning

GRAYBAR1

MEMBER
2009 HONDA ACCORD
2.0L
4 CYL
2WD
AUTOMATIC
148,000 MILES

I've been hearing a noise in the morning, well whenever I turn car on. I've notice when I leave ac knob on, when I go to turn car on it makes a rubbing noise or like a bearing noise. Any idea?

Monday, May 10th, 2021 AT 1:31 PM

5 Replies

KASEKENNY

MECHANIC
18,907 POSTS

More than likely this is the compressor clutch engaging when the engine is turned on.

Can you get a recording of this noise?

More than likely it will need a compressor clutch or compressor. However, if we can get a recording then that will help us figure this out.

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

Please let us know but there is a bearing in the compressor so it makes sense that this is what it is.

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Tuesday, May 11th, 2021 AT 5:30 PM

GRAYBAR1

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3 POSTS

Thank you sir. I appreciate your feedback. I will try to get a recording. I have spread your website to my friends and family.

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Wednesday, May 12th, 2021 AT 7:41 PM

KASEKENNY

MECHANIC
18,907 POSTS

Thank you so much. We are here to help so we appreciate your recommendation.

Please let us know when you can get the video and I am sure we will figure this out. Thanks

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Thursday, May 13th, 2021 AT 6:52 PM

GRAYBAR1

MEMBER
3 POSTS

You're welcome. Today I made sure A/C knob was set to off, and it made the same noise, but for like half a second. Other times it's a second or so. I will record noise and upload. Thank you sir.

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Thursday, May 13th, 2021 AT 7:38 PM

KASEKENNY

MECHANIC
18,907 POSTS

Okay. That is good to know. It could still be compressor related but the way to confirm this is to take the belt off and make sure it does not do it when starting the engine with the belt off.

This way we know for sure it is pulley related, we just need to find which one.

https://www.2carpros.com/articles/replace-serpentine-belt

However, if you want to leave it on and just get the recording, we may hear it and know exactly what it is so that may be the best place to start.