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Old 03-03-2021, 07:54 PM   #1
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Clunking/knocking noise

I have a 2011 Fleetwood and since day one new there has been a clunking/knocking noise coming from underneath the front seat area. I know this is a crappy description but anyone have any ideas? Iíve gone underneath and try to rattle things, ridden in the bay behind front wheels and still canít figure out what it is. 10 years and it hasnít caused any problems, just annoying. TIA
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Old 03-03-2021, 09:07 PM   #2
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I read a story a long time ago about a guy that was having clunking/banging going on under his seat. It turned out to be a can of soda under the seat and the can was rolling about banging into the seat pedestal. Maybe?
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Old 03-03-2021, 09:25 PM   #3
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Need more info. Is it on turns, going over bumps, stopping, starting, ????

Maybe there is a spot on the house mounting that wasn't welded. I have seen that before.
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Old 03-04-2021, 09:01 AM   #4
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It is pretty heavy sounding. Happens at 5+ mph with going over the slightest bumps. Donít notice it at fwy speeds. At first I thought it was the pull out trays bouncing around but took them out to test drive and didnít change noise.
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Old 03-04-2021, 09:58 AM   #5
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We had an 09 Allegiance with the same type noise under the RF seat. It seems that the welds securing the chassis to the body were missing.
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Old 03-04-2021, 10:04 AM   #6
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Since you say it's maybe more noticeable going over bumps etc. at slower speeds, have you by any chance taken a look at your shock bushings, sway bar bushings etc.? I had the same exact noises happening for a while on ours and was puzzled. I looked around quite a bit before finding the problem. ON ours, it was the sway bar link bushings at the frame. Not the ones that the front torsion bar pivots on but, the ones that link that torsion bar to the frame.

They get a tremendous amount of stress on them over the years and they finally just give up the ghost and disintegrate. And the only way to see them is to get under the front end with a flash light and look at ALL the connection points for that torsion/sway bar. One more potential is, a broken support weld. That is, the coach builders often weld in pieced of steel from a sub frame that they've added, to outer steel structural components. And sometimes, those welds break loose and are not easy to find.

Look for rust at a weld. Rust indicates a crack or a full break for the most part. Although not normally loud enough for folks to actually HEAR, a glued on bracket from the structural part to the fiberglass can bang around too when the glue breaks loose. Things like grills, headlight brackets, hood brackets and more are quite often GLUED to the fiberglass insides. And, they break loose quite often. Let us know.
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Old 03-19-2021, 01:33 PM   #7
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I have a Tiffin on a Freightliner chassis and we, too, had a seemingly random "clunk" under the front seat.

In my case, it had something to do with worn shock bushings or sway-bar bushings. I can't say which it was, exactly.

I lived with the noise during our first 100 miles or so and then we parked it for about a year while we did renovations and mechanical improvements - including new shocks and a new sway bar.

After those items were replaced, the sound was gone.

Honestly, I had forgotten all about the noise when I replaced the components, otherwise i would have inspected them more carefully when I removed them.

Anyway, I'd look at any wear or play in those areas.
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