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Old 12-05-2020, 08:13 AM   #1
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Anthem Step vibration or wind noise

At about 65 to 70 mph I have an awful noise like a piece of paper flapping in the wind. I have read all the older posts here from different guys that fixed their step noises and apologize in advance posting a new thread. Had the coach at NIRVC and verified my awful wind noise but they could not fix the problem and seem to think itís a vibration not wind noise. I am going to be foaming and insulating the step drawer today but want to make sure I get everything while doing it. I canít see where everyone is spray foaming their steps from the back side or under the step cover. My whole step box is wrapped with a black tyvek type material and appears no way to spray foam into the box. NIRVC taped the outter top perimeter to try and cure the noise possibly this is blocking my access? I purchased a can of good stuff spray foam and a roll of rock wool sound deadening insulation for the drawer section just need to address the rest. I understand if some are sick of seeing this question again but I canít take driving this rig with this noise itís not enjoyable. Thank you all in advance.
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Old 12-05-2020, 08:36 AM   #2
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Here is a long photo post of what we did on the Classics. Lots of photos of where to foam on the frame of the step well, etc. The tubing of the frame was howling as the wind passed it on my coach.

Using a piece of 1/4 in tubing taped to a 1/4 dowel will allow you to get into those can't reach spots. There are photos of the tool I made in the post as well. Lots of great feedback from others on the 5 pages.
https://www.irv2.com/forums/f278/lot...-217444-3.html
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Old 12-05-2020, 09:03 AM   #3
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I pulled back the gray duct tape NIRVC used and this is what I found. Did someone cut that tyvek material or was this a factory issue in your opinion? Not sure factory would leave wood exposed there.
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Old 12-05-2020, 09:18 AM   #4
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Not sure what part of the step that is, looks to be inside? My steps had nothing there but an air gap. See if you can match up the photos of where that wood is to my photos where I had to add foam.
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Old 12-05-2020, 09:38 AM   #5
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See comparison. Yours was not cut like mine is
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Old 12-05-2020, 12:09 PM   #6
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It's hard to say if the factory saw the gap and filled it with what was handy, or if it is was the dealer trying to fix the problem. I would spray it with some quality paint or undercoating to seal it.
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Old 12-05-2020, 12:09 PM   #7
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You probably have the same issue as many with wind noise from the step area. I would also check the bottom bolt that holds the fender in place. It is a flimsy design with a long bolt and spacer. Mine was loose down low and the fender made a hell of a rattle noise at cruising speed. Just a fwiw just in case.

Best of luck.

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Old 12-05-2020, 12:16 PM   #8
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Quote:
Originally Posted by 737 Driver View Post
You probably have the same issue as many with wind noise from the step area. I would also check the bottom bolt that holds the fender in place. It is a flimsy design with a long bolt and spacer. Mine was loose down low and the fender made a hell of a rattle noise at cruising speed. Just a fwiw just in case.

Best of luck.

Tor
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Good advise, I forgot about those. Now that you mentioned it, I used long hex head concrete screws used to screw down pool enclosures as that is what I had on hand. They worked great.
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Old 12-05-2020, 03:52 PM   #9
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By removing the tape and spraying whole box with foam I did see it ooze through to the inside step cover frame. I also used rockwool sound insulation and packed the step drawer. Once I get back on the road we will see if that solves my problem. Thank you everyone for your input!
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Old 12-05-2020, 06:25 PM   #10
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If you look forward in and from your wheel well, there is a piece of ABS about 18" x 10". It appears to act as a sort of reverse mud flap, maybe to protect the stair mechanism from catching debris slinging from the tire? It's secured along the top edge with some screws into the frame. In my case that ABS began to tear just below the attachment point and at ~60mph would flap/vibrate and make an awful, rhythmic banging noise. This was on my 18 Anthem. The mother ship sent me a new one which eventually tore in the same area, so I just removed mine all together.

Hope this helps
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Old 12-05-2020, 09:30 PM   #11
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Bruce, funny you say that mine tore as well so I ripped it off and never bothered with replacing it but thanks for pointing it out. I am on my second set of steps due to a hammer rivet coming loose making the steps wobble so the guard/flap is the least of my problems on the steps I guess.
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Old 12-06-2020, 07:28 AM   #12
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After the foam sitting overnight my step cover has no power at the switch. Checked the fuse and fine. Iím worried the foam that oozed through could have messed something up. Any ideas? I canít reach the strap to manually pull it out either.
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Old 12-06-2020, 12:34 PM   #13
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Quote:
Originally Posted by buddy110 View Post
If you look forward in and from your wheel well, there is a piece of ABS about 18" x 10". It appears to act as a sort of reverse mud flap, maybe to protect the stair mechanism from catching debris slinging from the tire? It's secured along the top edge with some screws into the frame. In my case that ABS began to tear just below the attachment point and at ~60mph would flap/vibrate and make an awful, rhythmic banging noise. This was on my 18 Anthem. The mother ship sent me a new one which eventually tore in the same area, so I just removed mine all together.



Hope this helps


X 2. We had the same problem. Took us 8 months to figure it out.
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Old 12-24-2020, 08:18 PM   #14
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To all who have posted any assistance to my post I appreciate all of your suggestions. I finally have no more wind or vibrating noise after following responses on this forum.

It is the first time I have driven my rig with no noise and could not be happier on my way to Pelican Lake in Naples.

Chuck I very much appreciate your detailed previous old post and pictures as they helped tremendously compare to my step box. I even followed your direction in making an extension to spray the foam far up on top which made it easier.

I did end up wearing quite a bit of spray foam but well worth it. It was time for a haircut anyway.

Thank you all again, so appreciative really.
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