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M450 (Unique Issues) If you have a unique issue with your M450 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M450 Parts here too. NO DISCUSSION OF ANY OF THE M450 LAWSUITS ALLOWED HERE.

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Old 08-03-2016
JohnLombardozzi JohnLombardozzi is offline
Junior Member
Join Date: Dec 2013
Location: Herndon
Posts: 12
Default Heat From Engine Compartment

I am having a difficult time keeping my Coach Cooled while traveling.

Has anyone done extensive work in order to keep the Coach cool. Some suggestions I have heard:

1) Remove the muffler from the rear chase and have it wrapped.
2) Wrap the exhaust pipe coming from the TurboFan to the exhaust Chase.
3) Install Dometic Quick Cool Ducts to improve air flow by bypassing the ceiling vents.

I have already rebuilt the rear engine compartment service hatch door and doubled the insulation area which has improved things but more needs to be done.

Questions I need help with:
1) What is the best Insulation & sound material and where can I buy it.
2) Does anyone know of a spray foam insulation material that will seal the compartment ?
3) Has anyone installed the Quick Cool Duct?
4) Has anyone done work to improve the air flow and cooling of the rear area behind the rear closet.

John Lombardozzi
Herndon, Va
2005 Lxi 450
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Old 08-03-2016
Trees's Avatar
Trees Trees is online now
Senior Member
Join Date: Dec 2007
Location: Elida
Posts: 570

Hi John, I'm no authority on 450's, but I would definitely check you exhaust chase area and make sure everything is sound there, no leaky muffler or pipes and whatever insulation around the compartment is good. Do you try to cool your coach with chassis or engine a/c or do you run generator and house a/c's? We just finished a trip in 90 degree days in our BMC and ran generator and house a/c's. Stayed comfortable but didn't get cold by any means. Good luck
Tim Rees
Elida, Ohio
1995 BMC 37 sold
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Old 08-04-2016
GEEZER GEEZER is offline
Senior Member
Join Date: Apr 2013
Location: Azle
Posts: 457

Has anyone done an extensive clean and service on your Air Conditionng equipment. If condenser and evaporator coils are not clean it can loose capacity. Just a thought.
Steve and Vonda Ricketts
Azle, Texas
1983 FC35SB (SOLD)
2003 Jeep Rubicon.
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Old 08-04-2016
Mike Hohnstein's Avatar
Mike Hohnstein Mike Hohnstein is offline
Senior Member
Join Date: Jan 2008
Location: NW Milwaukee Metro Area
Posts: 5,944

Not to worry, it's a heat wave, cooler weather will be around soon.
Mike Hohnstein
FMCA 97824
Germantown, WI

PM: mhohnstein@wi.rr.com
414 303 7079
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Old 08-04-2016
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DonB DonB is offline
Join Date: Jan 2008
Location: Eureka
Posts: 4,500

I have trouble believing that the engine/exhaust heat is making that much difference in the total coach temperature. I'm not saying that you shouldn't be concerned about the chase in particular, just that I doubt it or the engine is nearly the contributor compared with the sun beating down on a thousand square feet of exterior (my rough estimate assuming top, one side, and one cap at any given time).

Have you used a temp gun to measure the inside walls of the chase? With the stock muffler mine was very high, but with a non-baffled muffler it is now near outside ambient. I did that for safety, and am not aware that it made any obvious difference on the inside air temp.
Don Bradner
Current: 20 ft travel trailer
Prior: 2004 M380 Double Slide
Prior: 1990 WB40 "Blue Thunder"
and some SOBs

My location: www.bbirdmaps.com/user2.cfm?user=1
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Old 08-05-2016
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NoGas NoGas is offline
Senior Member
Join Date: Apr 2012
Location: DFW & PHX
Posts: 2,737

Have you seen the extensive postings about same subject over on the M380 side? Including:
A video of what I did - https://youtu.be/em5apEFKfP0

Before my mod temps were similar as Dons, maybe 15-20 degree temp increase inside the rear closet with the walls getting very hot & some noticeable effect in rear coach living area. My situation was different though in that I had both an exhaust leak and the space around muffler in the exhaust chase was plugged by collapsed (and burned) insulation. The underside of bird grate up top also had evidence of extreme heat (soot). After my mod, which included a straight pipe, lining the chase with sheet metal and wrapping the exhaust pipe, closet walls now run ambient even after long grade pulls. Your 450 results may vary.
Van & Toni in TX & AZ
2004 M380 DS & 2013 Fiat 500 Pop or 2021 Jeep JL
NoGasWelcomeAboard on YT

Last edited by NoGas; 08-05-2016 at 09:00 AM.
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Old 10-14-2016
Doubledoc Doubledoc is offline
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Join Date: Jul 2009
Location: Bend
Posts: 186
Default Engine bay cooling

Two 12" radiator cooling fans, controlled through an adjustable thermostat controller and the associated relay, switches, timer, fuses and wiring were installed in the engine bay area to remove engine, turbo, and exhaust heat as needed during operation and after engine shut down. The system can be operated with ignition control or directly from the batteries.

The controller, relay, timer and switches were installed on the inside of the door of the power distribution box.The fans were installed on the engine bay door up against the grills on both the curb and road sides. Thin mounting tabs (four for each fan and made of brass) were made and attached to the fans and then to inside of the fiberglass frame.

The fans (Spal #30101522) are single speed pusher fans drawing 13 amps at 12 v dc and rated at 1300 CFM. The controller (Derale # 16789) has an adjustable thermostat (150 degrees F - 240 degrees F) with a staggered control for two fans, Each fan circuit is rated at 35 amps continuous. Fan-1 turns on at the thermostat setting and fan-2 turns on 15 F higher than fan-1. Each fan turns off when temperature drops 10 F below the turn on temperature.

Fan-1 can be manually turned on without the thermostat in the circuit by using the AC input on the controller. A timed switch with setting up to 30 minutes was added as well.

The 12 v dc power (battery and ground) was obtained at the inputs to a Vanner unit just behind the power distribution box. A 24 v+ dc ignition activated source and another ground were found inside the power distribution box. The 24 v dc ign is fed to the coil of a relay which turns a 12 v dc battery source into a 12 v dc ignition source for use by the controller.

The 12 v dc + power lead, the 12 v dc + fan-1 and fan-2 leads, and the thermostat sensor leads are fed into the top of the Power box near the hinged door and covered in flexible conduit and sealed with silicon rubber. The fan grounds go directly to the ground on the Vanner unit. The thermostat sensor was screwed into a 3/8" bronze elbow and placed in the area of the turbo's and exhaust. The sensor leads had to be extended and were placed in flexible conduit.

I plan to use trial and error to set the thermostat starting at the lower temperature. The system cost about $400 with most of that spent on the fans and controller.
Jim Colby
Bend, Oregon
'06 450LXI
"Dream Catcher"
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Old 02-26-2017
dbmotors dbmotors is offline
Join Date: May 2015
Location: Midland
Posts: 37

I to have installed the fans on the engine bay door and it made a measurable difference in the bedroom temperature. Have also installed a aftermarket muffler that is much smaller in length and diameter from the stock unit, more area for air to circulate around it which helps dissipate heat.
Bob Young
Midland, TX
2006 450LXI
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Old 07-23-2017
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rbbuscher rbbuscher is offline
Senior Member
Join Date: Jul 2008
Location: Elkhorn, NE
Posts: 255

I also put a after market performance muffler on my 450. Not only did it help with the heat in the bed room. It sound great to. Let that Cat breathe.

Bob & Noelle Buscher
The Dog House
2006 M450 LXi
Elkhorn, NE
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Old 07-27-2017
travler travler is offline
Junior Member
Join Date: Aug 2015
Location: glendora
Posts: 20
Smile exhaust fans

hi guys
i have put fans in the engine bay and a smaller exhaust system both if i new how to up load pictures i would any one that wants to send me an email at john@jdeco.com i will send picture the 450 guys have an email list that we share info on all the changes that we have made or we are going to make there is a lot of info there
hope this helps John
john edwards
glendora, california
43 LXI
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