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'Howling' sound from front end
11-18-2011, 07:38 AM
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#1
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Senior Member
Workhorse Chassis Owner National RV Owners Club Ford Super Duty Owner Carolina Campers
Join Date: Aug 2011
Posts: 1,022
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I have a coach I bought in April on a Workhorse chassis. At approximately 35mph there is a resonant 'howling' sound that comes from the front end. at about 40mph it goes away. Has anyone ever heard this?
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11-18-2011, 08:53 AM
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#2
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Senior Member
Workhorse Chassis Owner Winnebago Owners Club
Join Date: Oct 2002
Location: Way down yonder, below New Orleans
Posts: 3,958
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I have heard of others hearing similar situations and they found the source to be the coach's GRILL louvers...or something cosmetic on the coach front. You may want to do a search using various terms to see if you can unearth those threads.
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Itasca SC 2010 37F on W-24 WB248" stock + plug wires vent kit added.
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11-18-2011, 09:04 AM
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#3
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Senior Member
Join Date: Mar 2009
Location: N. Central AZ
Posts: 210
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We get a howling whistle sound at around 60 MPH. I have always blamed it on the electric "Air" horns mounted on the top just over my head!
H
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'01 National RV Tropi-Cal, Ford V10, '01 Suzuki GV 4X4 Blue Ox Tow Bar,300 Watts Solar, 2500 Watt '458' Inverter, NO TVs
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11-25-2011, 10:03 PM
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#4
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2004
Location: San Jose, Califorinia
Posts: 276
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Quote:
Originally Posted by hdossett
We get a howling whistle sound at around 60 MPH. I have always blamed it on the electric "Air" horns mounted on the top just over my head!
H
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I was getting a sound similar and it was found that the windshield wasn't centered in the opening and had an air leak and a water leak also. It was redone at the factory and no more noise from it. Thankfully  Bebop
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Bill, Jann
2004 Rexhall Rexair, W22, 3250BSL, Vortec 8.1, Allison 5 speed, 2 slides, Saturn SC2 and LW1 toads.
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11-26-2011, 05:39 AM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
Posts: 564
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I have an 05 Dolphin and had a howling noise in the front at about 60 Mph depending on the direction of the wind. It turned out to be a vibration in the right side of the grill. To test this rap a bungy cord tightly around the grill bars and see if it stops. If so remove the grill and place 1/4" rubber spacers between the mounts. Or do what I did and leave the bungy cord on. It works and is a good coversation peace.
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11-26-2011, 06:17 AM
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#6
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 1,390
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We were a national dealer. There was a recall to fix this problem. as another said, it is the grill that is causing the problem.
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15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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11-26-2011, 06:33 AM
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#7
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Senior Member
Workhorse Chassis Owner
Join Date: Feb 2005
Location: s/w az
Posts: 440
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the grill
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2007 NRV DOLPHIN LX 6342
WORKHORSE W-22
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11-26-2011, 07:18 AM
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#8
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Senior Member
Workhorse Chassis Owner National RV Owners Club Ford Super Duty Owner Carolina Campers
Join Date: Aug 2011
Posts: 1,022
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Quote:
Originally Posted by ga traveler
We were a national dealer. There was a recall to fix this problem. as another said, it is the grill that is causing the problem.
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This is great! Thanks! What was the fix?
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11-26-2011, 07:21 AM
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#9
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Senior Member
Workhorse Chassis Owner National RV Owners Club Ford Super Duty Owner Carolina Campers
Join Date: Aug 2011
Posts: 1,022
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Quote:
Originally Posted by speed racer
I have an 05 Dolphin and had a howling noise in the front at about 60 Mph depending on the direction of the wind. It turned out to be a vibration in the right side of the grill. To test this rap a bungy cord tightly around the grill bars and see if it stops. If so remove the grill and place 1/4" rubber spacers between the mounts. Or do what I did and leave the bungy cord on. It works and is a good coversation peace.
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LOL. I'll give this a try. Removing and re-painting the black paint on the grill is on my to-do list anyway. Now I have additional motivation. Thanks!
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11-26-2011, 01:07 PM
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#10
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Senior Member
Workhorse Chassis Owner
Join Date: Mar 2007
Location: Pikeville, NC
Posts: 1,412
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Ramblin-
Read my old thread on this subject. It cost me a ton of money to fix this problem. Nobody, including Newmar, ever heard about it.
Take the grill out- mine is held in with about 6 screws. An easy job.
Go for a "test run" and if the noise is gone "BINGO". A few bungies will solve your immediate problem.
I welded extra supporting rods into the grill's horizontal pieces and repainted it.
Also, please add your type, model and age, etc, of your motorhome in your signature block. It makes it easier for us to respond to your questions- thanks!
Good luck,
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Max H,
2002 Newmar Mountain Aire, 37', 3778, W-22, 8.1 Vortac, Ultra Power upgrade, CAI (cold air intake), Taylor wires, colder plugs, Koni shocks.
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11-26-2011, 05:31 PM
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#11
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Senior Member
Join Date: Nov 2005
Location: Home location, Matlock, WA
Posts: 196
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Quote:
Originally Posted by Ramblin
I have a coach I bought in April on a Workhorse chassis. At approximately 35mph there is a resonant 'howling' sound that comes from the front end. at about 40mph it goes away. Has anyone ever heard this?
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You don't say what year and model your coach is, but some of the earlier coaches like my 2003 Dolphin had flat bars making up the grill in front of the radiator. They howled when the air blew through them at certain speeds. The factory modification was to snap in some rubber strips between the bars.. The strip were made of material that was similar to the sidewalls on tires. They broke up the resonant vibration.
Bob, wa7hra........
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2003 Dolphin 5342, W-22 Chassis, 22.5" Tires w/a spare, Monroe Shocks. Ultrapower ECM Upgrade.
2004 Toyota RAV4 toad, 2wd, 5 speed. US Gear toad brake.
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11-26-2011, 06:39 PM
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#12
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Senior Member
Ford Super Duty Owner
Join Date: Mar 2011
Posts: 314
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My 2008 Bounder had a moaning sound around 50 and up. I thought it was the left front tire. Then I read somewhere on this forum abought the grill. I removed the tubler grill and gave it a test ride. No moaning. I also read on this forum that the cure is to put 5/16 wood dowel inside the grill tubes with glue. I did this and no more moaning.
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2008 Bounder 35E, TruCenter, TigerTrack, 5star Tune, 2011 HHR, US Gear UTBS
"Democracy is two wolves and a small lamb voting on what to have for dinner.
Freedom is a well armed lamb contesting the vote."
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11-27-2011, 05:51 AM
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#13
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 1,390
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Quote:
Originally Posted by Ramblin
This is great! Thanks! What was the fix?
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The factory had us fill the hollow backside of the grill with silicone.
__________________
15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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11-27-2011, 06:09 AM
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#14
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Senior Member
Workhorse Chassis Owner National RV Owners Club Ford Super Duty Owner Carolina Campers
Join Date: Aug 2011
Posts: 1,022
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Quote:
Originally Posted by ga traveler
The factory had us fill the hollow backside of the grill with silicone.
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Wow. Is the grill purely cosmetic? I would think airflow through there would be important to get air through the radiator.
(RV info added to sig line test)
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2002 National Dolphin LX 6356
Workhorse W-22 chassis
WARNING: See THIS THREAD before you take any of my advice.
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