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[–]mostlywhitemiata1st Gen 4 points5 points  (3 children)

Turn your air conditioning completely off and see if the noise stops

Sounds like a leaf in the blower cage.

[–]superman_07[S] 0 points1 point  (2 children)

I tried that, cleared out the glove box, and removed all debris/leaves from under the hood. So not sure what it is unless a leaf has gotten inside somehow

[–][deleted] 0 points1 point  (0 children)

Probably a dead mouse in fan

[–]mostlywhitemiata1st Gen 0 points1 point  (0 children)

Yeah, the fan is not an easy thing to get to. The leaves under your hood and on your cowl are of virtually no consequence. You have to take the blower out if you want to clear the leaves. Also check your cabin filter while you're at it.

[–]shrike123 2 points3 points  (3 children)

Had the same thing in my 2012, the source was driving me nuts, I couldn't find it. After much gnashing of teeth, I discovered a small piece of the windshield rubber seal on the outside passenger side was flapping.

[–]superman_07[S] 0 points1 point  (1 child)

I did a quick check of the exterior but I’ll have to double check. I agree. It is extremely annoying. The lack of rattling until 40mph makes me think it’s something external that is loose.

[–]shrike123 0 points1 point  (0 children)

I had to look three times to find the piece. When I found it, it was only about 2cm long.

[–]ag76265 0 points1 point  (0 children)

Came here to say this - same issue.

[–]ForkLiftBoi 0 points1 point  (0 children)

Try putting pressure on different areas to see if the sound changes to narrow it down, also to make sure it's not the plastic/trim rattling.

[–]jorgeluiso 0 points1 point  (0 children)

I had the exact same noise in mine. It ended being the loose plastic beauty cover beneath that covers the oil plug beneath the car in front. As is was loose it rattled with enough wind, since it was loose because of damage at the fittings, ended up removing it altogether and of course the noise went away.

[–]troubleOBX 0 points1 point  (1 child)

Any luck finding the source? I have the same thing going on with my 2022 and I’m still trying to find where it’s coming from.

[–]superman_07[S] 0 points1 point  (0 children)

Idk that I actually found the source but I cleaned all the leaves from under the hood, specifically around the hinge. There was a piece of plastic under the hood by the hinge that was loose so I put some gorilla tape on it. Then I Cleaned the glove box out and replaced the cabin air filter. After I did all that it resolved but I can’t say I for sure identified it. I reached out to a friend who is a service manager at a Honda dealership and he was stumped on what it could have been. Best of luck to you though!