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08-07-2007, 05:44 PM
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#1
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Member
Workhorse Chassis Owner
Join Date: Feb 2007
Location: Panama City FL
Posts: 36
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We have a 2007 Winnebago Voyage on a Workhorse W22 chassis (8.1L Gas).
We have been traveling and today noticed a new sound.
Whenever we accellerated hard or for an extended period, we heard what sounded like a vacuum leak under the dash in front of the driver. The noise stopped right after we stopped accellerating.
What is the noise and is it normal or something to try to fix?
Thanks
Gordon
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08-07-2007, 05:44 PM
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#2
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Member
Workhorse Chassis Owner
Join Date: Feb 2007
Location: Panama City FL
Posts: 36
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We have a 2007 Winnebago Voyage on a Workhorse W22 chassis (8.1L Gas).
We have been traveling and today noticed a new sound.
Whenever we accellerated hard or for an extended period, we heard what sounded like a vacuum leak under the dash in front of the driver. The noise stopped right after we stopped accellerating.
What is the noise and is it normal or something to try to fix?
Thanks
Gordon
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08-07-2007, 05:56 PM
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#3
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by gordonandpatti:
Whenever we accelerated hard or for an extended period, we heard what sounded like a vacuum leak under the dash in front of the driver. The noise stopped right after we stopped accelerating. </div></BLOCKQUOTE>Gordon, I would suggest that if you have the opportunity to bring this to the attention of a service center that they would be able to help you resolve this condition.
Winnebago uses vacuum hoses behind the dash to control the heater and vent controls controls. Obviously if there were a leak in this system your controls would be compromised and that would present a different problem.
In front of the driver's position could suggest something in front of the fire wall as well. There are a number of hydraulic lines and devices there that could be making some type of sound that could be interpreted on your part as something to be concerned about.
Your WCC service center should be able to assist you with this and I wish you well. Please let us know if you need any further assistance or the name of a service center in your immediate area.
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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08-07-2007, 07:23 PM
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#4
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Senior Member
Workhorse Chassis Owner
Join Date: Oct 2004
Location: California Desert
Posts: 357
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Does the noise go away when you turn the AC off? If it does, you probably have a bad condenser clutch, and the condenser needs to be replaced. That happened on my 2004 W20 chassis a while ago. Mine was replaced under WH warranty.
__________________
2004 Southwind 32VS
2014 C-Max toad
Workhorse chassis
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08-08-2007, 04:20 AM
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#5
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Senior Member
Winnebago Owners Club Pond Piggies Club Appalachian Campers Mid Atlantic Campers
Join Date: Dec 2002
Location: Sarver, PA/Crystal River, FL/Shelocta, PA
Posts: 4,671
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This should be your heater/AC vacuum diagram.
-Tom
__________________
Sarver, PA/Crystal River, FL/Shelocta, PA · FMCA 335149 · W3TLN 2005 Suncruiser 38R · W24, no chassis mods needed · 2013 Honda Accord EX-L · 2008 Honda Odyssey EX-L
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08-08-2007, 06:04 AM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Nov 2005
Posts: 423
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Also be sure it's not the electric fans and/or the engine fan engaging. With the recent hot weather recently, it's possible you may have never heard these fans come on before.
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08-08-2007, 06:19 AM
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#7
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Streamerman:
Also be sure it's not the electric fans and/or the engine fan engaging. </div></BLOCKQUOTE>You make a good point however the fans would not be subject to disengagement when the throttle pressure is reduced. Once them babies start spinning up they'll continue to run until the lo-limit is achieved. 
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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08-08-2007, 10:49 AM
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#8
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Senior Member
Workhorse Chassis Owner
Join Date: Jan 2007
Location: Roving, Datastorm users 3192
Posts: 755
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Tom N: This is not to the topic but love the "Wheels of Life" sig.
To Topic: There may be a line that has come off somewhere another problem. I have had this happen a few times on cars. Some vacuum lines are "ported" and some are not, ported means that there is little or no vacuum under SOME condtions, (Example, crusing) and a lot under other (Example, acceleration) I would do a good visual looking for an open port somewhere.
__________________
Nothing adds excitement like something that is none of your business.
2005 Damon Intruder 377W Radio Active as WA8YXM
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08-08-2007, 01:07 PM
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#9
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Junior Member
Join Date: Jan 2007
Posts: 21
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Gordon,
My 07 W20 does the same thing. It has something to do with the AC. You'll notice that if you turn off the AC you won't hear the noise. Mine usually only does it after accelerating hard, like merging into traffic, or when climbing a long hill.
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08-08-2007, 01:14 PM
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#10
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Marshall316:
My 07 W20 does the same thing. </div></BLOCKQUOTE>  Thank you for contributing!
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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08-08-2007, 02:52 PM
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#11
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Senior Member
Workhorse Chassis Owner
Join Date: Oct 2004
Location: California Desert
Posts: 357
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">My 07 W20 does the same thing. It has something to do with the AC. You'll notice that if you turn off the AC you won't hear the noise. Mine usually only does it after accelerating hard, like merging into traffic, or when climbing a long hill. </div></BLOCKQUOTE>
Search for a thread here called "Whining while Accelerating". You need a new AC compressor.
__________________
2004 Southwind 32VS
2014 C-Max toad
Workhorse chassis
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08-10-2007, 03:43 PM
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#12
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Member
Workhorse Chassis Owner
Join Date: Feb 2007
Location: Panama City FL
Posts: 36
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Thanks for the quick responses and all the help.
Stopped for service at a Workhorse GMC Truck service center for another problem;
service manager and Workhorse technician said noise was not engine related;
they thought it was Winnebago installation as part of dash AC system.
It does not go on if dash AC is off, so I'm thinking they're right.
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08-10-2007, 03:54 PM
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#13
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by gordonandpatti:
It does not go on if dash AC is off, so I'm thinking they're right. </div></BLOCKQUOTE>Me too!
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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08-11-2007, 03:15 PM
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#14
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Senior Member
Workhorse Chassis Owner
Join Date: Oct 2005
Location: leesburg florida
Posts: 184
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my money is on the ac compressor clutch had same problem workhorse changed a/c clutch noise
was gone
Sal Avitabile
__________________
2005 Fleetwood Bounder 34F
8.1 Vortec Chev, Allison 5 Speed,2006 saturn vue 6Cyl auto Frt wheel dr Toad
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