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Old 12-06-2017, 03:18 PM   #1
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Unhappy Chirping sound from dash, convinced its HVAC fan

Hi all!

I'm a really new Sonic owner, and I love my car so far except for this one nagging issue! I've been having an intermittent "chirp" sound coming from my dash. I initially thought HVAC fan, so I brought it to my Chevy dealer and they kept it for 3 days because they couldn't reproduce it. So naturally, they dismissed my theory immediately.

Ended up changing my air filter (it was in backwards?) and said they thought the noise was because my timing belt cover was loose on all 4 bolts. So they fixed that, and sent me home with a bill since that stuff was not covered by either my power train warranty or my vehicle protection plan because it was considered "maintenance" repairs. (grrr).

Fast forward to 2 days after I get it back, and I'm hearing the noise again!!!! It happened this morning on my way to work, so I played with the fan a little while it was happening. It's definitely the HVAC fan, because when I turn it off I can actually hear the noise winding down with the fan.

So now I'm frustrated because I don't want my car to be in the shop AGAIN, only to be told they can't reproduce it and charge me another fee. It's in the middle of winter and the last thing I want is for my fan to go out! Any advice is welcome, I'm not sure what I should do now.
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Old 12-06-2017, 04:21 PM   #2
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My fan was noisey for about 2 years, and I just let it be. They are known to get noisey. I would contact chevy customer service regarding your dealership visit. It would be a comeback it you came in for the same problem, so it would be on them if they can find nothing wrong.
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Old 12-06-2017, 05:24 PM   #3
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Thanks for the advice! I decided to call the guy I'd been working with and let him know whats going on. They are going to order the fan motor and bill it to my extended warranty, and if there's a deductible they are going to take care of it for me!
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Old 12-06-2017, 08:31 PM   #4
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Mine seems to be doing the same thing, coming from the passenger window vent. Let me know what they come up with at the dealership.

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Old 12-07-2017, 03:50 AM   #5
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Iím having the exact same problem! Itís definitely coming on the passenger side, happens when air is hot & cold, and slows down with the speed of the fan when I turn down the vent power.
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Old 12-07-2017, 04:33 AM   #6
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This is gonna sound really crazy guys, but I had a similar noise problem, and I swore up and down it was AC related because at idle with the fan off, I wouldnít hear it, but when I turned the fan on I got a crystal clear chirp, and I couldnít tell where... tore everything apart and cleaned my hoses, replaced the hvac and still was there... this is gonna sound dumb but... it was actually a loose spark plug causing the chirp, it had burned my coil pack as well, if youíre not checking for correct torqued plugs, and making sure your coil boots look fine, please start doing that every 5k miles or so. It takes 5 minutes flat, and you can do it when you change your oil. Best of luck!


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Old 12-07-2017, 08:34 PM   #7
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I managed to take a few videos of the sound happening to show the mechanic. I also have a new symptom of a weird mechanical noise happening if I shut off the car with the fan running. Please see them here!

Mechanical noise:
https://drive.google.com/open?id=1b-...iQiVkn7MKDPUQ_

Chirpy cricket while air is running:
https://drive.google.com/open?id=14m...mOwLTJI5EOMPRm
https://drive.google.com/open?id=1eJ...9YUoAWIKW1OFoX
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Old 12-08-2017, 05:20 PM   #8
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Taking my car and the videos to the mechanic this afternoon after work. Wish me luck and pray the mechanic isn't deaf to the high pitched decibel the chirp is at
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Old 12-08-2017, 07:31 PM   #9
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Quote:
Originally Posted by nerfworthy View Post
Taking my car and the videos to the mechanic this afternoon after work. Wish me luck and pray the mechanic isn't deaf to the high pitched decibel the chirp is at


Good luck! Let us know what they say, if anything!
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Old 12-08-2017, 07:32 PM   #10
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Quote:
Originally Posted by Espysonic View Post
This is gonna sound really crazy guys, but I had a similar noise problem, and I swore up and down it was AC related because at idle with the fan off, I wouldnít hear it, but when I turned the fan on I got a crystal clear chirp, and I couldnít tell where... tore everything apart and cleaned my hoses, replaced the hvac and still was there... this is gonna sound dumb but... it was actually a loose spark plug causing the chirp, it had burned my coil pack as well, if youíre not checking for correct torqued plugs, and making sure your coil boots look fine, please start doing that every 5k miles or so. It takes 5 minutes flat, and you can do it when you change your oil. Best of luck!


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Iím definitely gonna check this! I didnít even think about that as a possibility
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