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06-24-2016, 07:13 PM
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#1
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Junior Member
Newmar Owners Club
Join Date: Sep 2015
Posts: 28
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Engine noise?
I have a 2005 Newmar Mountain Aire with the Chevy 8.1 engine. While cruising down the road I hear what sounds like a different noise that sounds like the engine is revving up, but the tach doesn't move. Then after a minute or so the sound goes away slowly, as it started. Is this a fan for the transmission? I have the Allison tranny btw.
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06-24-2016, 07:21 PM
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#2
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Senior Member
Tiffin Owners Club
Join Date: Jul 2014
Posts: 2,387
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I believe you are right. My 8.1 does the same thing.
__________________
Larry and Prissy Sharp
2006 Allegro Bay 37DB
2012 Toyota Yaris
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06-24-2016, 07:27 PM
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#3
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Junior Member
Newmar Owners Club
Join Date: Sep 2015
Posts: 28
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Thanks. The noise doesn't come on as often if I turn off the dash AC. I had a 2000 MH with the chevy 454 I think, and it did the same thing.
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06-24-2016, 07:39 PM
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#4
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,533
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What you are probably hearing is the temperature controlled hydraulic fan clutch engaging and disengaging. The rush of air through the AC condenser and engine radiator can be noisy under a load. This is normal.
Lynn
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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06-24-2016, 08:21 PM
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#5
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Senior Member
Join Date: Jun 2016
Location: South of Atlanta, Georgia
Posts: 2,145
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Sprinter Chassis motorhomes are very noted for this. The noise is quite apparent, and coupled with a marked drop in engine temperature before the fan shuts off.
Charles
__________________
'03 Ram 2500 CTD, 5.9HO six speed PacBrake std cab long bed Leer top and 2008 Bigfoot 25B21RB.. Previously, 2008 Thor Freedom Spirit 180, SOLD! 2007 Winnebago View 23H Motorhome, SOLD!
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06-24-2016, 08:32 PM
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#6
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Senior Member
Triple E Owners Club
Join Date: Feb 2014
Location: Oakbank, Manitoba, Canada
Posts: 282
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Quote:
Originally Posted by LETMGROW
What you are probably hearing is the temperature controlled hydraulic fan clutch engaging and disengaging. The rush of air through the AC condenser and engine radiator can be noisy under a load. This is normal.
Lynn
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+1 it will be the fan. Normal
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1999 Triple E Commander 3503FS on 20,500 F53.
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06-25-2016, 05:00 AM
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#7
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Senior Member
Join Date: Nov 2013
Posts: 5,783
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Yes, and I find the same. Using dash A/C makes it happen more frequently. One thing I will say, the system as loud as it is seems to work well when climbing those long hills.
__________________
2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
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06-25-2016, 05:13 AM
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#8
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Senior Member
Join Date: Mar 2012
Posts: 206
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Even if the engine does not need the cooling of the fan, using the A/C does. You need more air to remove the heat from the A/C system, so the fan kicks on.
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06-25-2016, 05:55 AM
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#9
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Senior Member
Workhorse Chassis Owner
Join Date: Sep 2007
Location: st.charles mo.
Posts: 1,482
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On my 04 Workhores chassis I have what is known as the cool pack. When you turn on the chassis A/C the two fans in front of the radiator come on. This also helps cool the radiator so the fan clutch doesn't engage as often.
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06-25-2016, 06:08 AM
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#10
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Senior Member
Join Date: May 2015
Location: Louisiana
Posts: 133
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Your fan clutch is working to cool off the engine as designed. After a steep climb onto a plateau in New Mexico last August, I had a water hose burst while on our maiden trip. I was unfamiliar at the time with a fan clutch. The Las Vegas Diesel Repair mechanics repaired the broken hose and replaced the fan ($450 fan and $100 lbr) and we were back on the road. Several miles down the road, the clutch engaged and it took me several agonizing minutes to realize that it was the new fan clutch doing it's job. It comes on at varying speeds and can sometimes be a little noisy, but I will take the noise any day, rather than an overheated system.
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06-25-2016, 01:28 PM
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#11
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,713
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That's a Workhorse W-series chassis, so those are probably the electric cooling fans rather than the engine driven one. They sound like a jet revving up when they come on! So yes, that is normal. The engine computer (ECM) turns them on when it detects extra cooling is needed.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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06-26-2016, 12:43 PM
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#12
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Junior Member
Join Date: Jun 2016
Location: Mooresville, NC
Posts: 10
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He's right....the 2 fans are kicking on, usually to cool the trans fluid and definitely associated with the transmission
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