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09-02-2014, 04:16 PM
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#15
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,678
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Quote:
Well there is a reason ALL the expensive high-end coaches are side radiator..... It's plainly better.
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Perhaps, but I think the main reason is that those high end models have larger engines that need more cooling. There is a practical limit to how many square inches of radiator you can get in a rear mount without totally obscuring the engine and the rear cap. There is also a real limit on how much air you can move through the rear, and how cool that air is. A side radiator can be larger, the fan pulls somewhat cooler outside air across the radiator, CAC and a/c condenser.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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09-02-2014, 05:14 PM
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#16
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Senior Member
Join Date: Aug 2012
Posts: 587
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My question is why have the MFG'S went to the side radiators.
If we like a floor plan, brand, or model, we don't have a choice of what Rad.
Appears to me that the later model have gone to the rear Rad.
Unless you go to the very upper price range $$$$$$$$!!
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John and Susan. New 2018 Chevrolet 2500 2 WHD . 6.6 Duramax 3.73 rearend. .4 door ,Short, Bed W/Topper. 2017 Grand Design 297 RSTS. Our rescue dog Annie. Still ,Full timing since 07-01-2011. No sticks and bricks.
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09-04-2014, 06:42 PM
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#17
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Senior Member
Join Date: Jul 2011
Location: Miami, FL
Posts: 611
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Quote:
Originally Posted by poppopc
My question is why have the MFG'S went to the side radiators.
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The rear radiator setup is less costly to build. The fan is direct drive, therefore no hydraulic motor, hoses and speed controls. The coolant and charge air cooler connections are shorter and less expensive. This allows the manufacturer to maintain their required profit margins under intense competition for sales in a tight market. Same reason the engine manufacturer keeps turning up the fuel on the less expensive bored block engine...such as the Cummins B. Few motorhomes ever see more than 100k miles anyhow....
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09-04-2014, 07:06 PM
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#18
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Senior Member
Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
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Serpentine belt change on our rear rad. coach can be change from the bottom in less than half an hour, using only the 1/2 breaker bar required to pull back the belt tensioning pulley. I've heard about all the other expensive nightmares, but have to wonder how many of these people are doing or have tried to do this job themselves? No it's not fun, and yes, you're going to get dirty doing it, but in my experience, if you're doing the majority of your own maintenance, this is not as difficult a job as what a lot of people make it out to be. I'm not crazy about the next chance to empty the holding tanks either...
Regarding rear rad. dirt (crud) buildup, I think this issue has been put to bed, or at least it's to the point where it's a lot less critical than it once was, since the slobber tube was discovered to be the root of all that evil. Now that everyone (hopefully) understands that issue, the previous crud buildup issues with resulting overheating seem to much less frequent?
Bottom line, I think a lot of the issues regarding rear radiators are based on hearsay, not practical experience. How many times a year to you need to service/inspect this engine and it's systems anyway? Once? And you're going to make a buying decision based on the inconvenience to do that? Not here. Not me anyway.
__________________
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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09-04-2014, 07:14 PM
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#19
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Gary RVRoamer
Perhaps, but I think the main reason is that those high end models have larger engines that need more cooling. There is a practical limit to how many square inches of radiator you can get in a rear mount without totally obscuring the engine and the rear cap. There is also a real limit on how much air you can move through the rear, and how cool that air is. A side radiator can be larger, the fan pulls somewhat cooler outside air across the radiator, CAC and a/c condenser.
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Every side radiator I've ever run across pulls the air from the engine compartment and pushes it out the side. Also, on our DSDP the A/C condenser is in front of the drivers side front wheel.
When I changed the belts it took me longer to find the correct wrench sizes than it did to do the actual change.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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09-04-2014, 07:23 PM
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#20
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Moderator Emeritus
Country Coach Owners Club Freightliner Owners Club
Join Date: Sep 2004
Location: Glen Allen, VA
Posts: 7,902
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Quote:
Originally Posted by Mr_D
Every side radiator I've ever run across pulls the air from the engine compartment and pushes it out the side. Also, on our DSDP the A/C condenser is in front of the drivers side front wheel.
When I changed the belts it took me longer to find the correct wrench sizes than it did to do the actual change.
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My CC side rad pulls air from the outside and into the engine compartment.
__________________
2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA
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09-04-2014, 07:43 PM
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#21
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Senior Member
Fleetwood Owners Club
Join Date: Sep 2013
Location: Southern Alberta
Posts: 112
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Quote:
Originally Posted by Mr_D
Every side radiator I've ever run across pulls the air from the engine compartment and pushes it out the side. Also, on our DSDP the A/C condenser is in front of the drivers side front wheel.
When I changed the belts it took me longer to find the correct wrench sizes than it did to do the actual change.
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My side rad coach pulls air from outside the coach and discharges over the engine and out the back. That is how they are designed, so always pulling air through the rad, not pushing it through.
__________________
2007 Fleetwood Revolution LE 40E, 400HP C9 Cat
2015 Ford F-150 Lariat Super Crew 4X4, Blue Ox Adventa LX and Patriot braking system
2012 Polaris Rzr 800 LE
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09-04-2014, 07:49 PM
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#22
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Senior Member
Join Date: Feb 2010
Location: Sunnyvale, CA
Posts: 1,195
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My side rad pulls in air from the outside and then into the engine bay as well..
Steve
__________________
The Green Machine -- 2000 Mountain High Coachworks Summit (Spartan chassis / Cummins ISC)
...and F-Troop: Fearghus, Fiona, and Frankie (Cairn Terriers)
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09-04-2014, 07:52 PM
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#23
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Community Moderator
Join Date: Aug 2011
Posts: 6,199
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Side rad vs rear rad?
Quote:
Originally Posted by Mr_D
Every side radiator I've ever run across pulls the air from the engine compartment and pushes it out the side.
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Every side radiator I've ever run across does the opposite of what you say.
Evidently this was debated before....
http://www.irv2.com/forums/f258/side...ow-205028.html
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09-04-2014, 07:57 PM
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#24
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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Quote:
Originally Posted by smlranger
My CC side rad pulls air from the outside and into the engine compartment.
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My Monaco too. Out to in. Never over 208.
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09-04-2014, 10:36 PM
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#25
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Senior Member
Join Date: Sep 2012
Location: MN
Posts: 292
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Quote:
Originally Posted by smlranger
My CC side rad pulls air from the outside and into the engine compartment.
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Mine is outside to inside as well.
__________________
Spinner & Gang
2000 MADP ISC350 2003 Jeep Liberty toad
"Working towards the next vacation!"
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09-05-2014, 05:40 AM
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#26
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 8,638
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Quote:
Originally Posted by smlranger
My CC side rad pulls air from the outside and into the engine compartment.
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Same here
__________________
2007 Fleetwood Revolution LE 40V
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09-05-2014, 05:53 AM
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#27
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Senior Member
Join Date: Jul 2011
Location: Miami, FL
Posts: 611
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Mr D, you are in trouble. Thus far, the out-to-innies are winning.
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09-05-2014, 08:44 AM
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#28
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Senior Member
Freightliner Owners Club
Join Date: Apr 2002
Location: Pensacola
Posts: 2,728
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Wow- At least all us low-brow rear radiator folks know which way the air flows......
__________________
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
2008 Suzuki Grand Vitara TOAD
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