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07-02-2011, 08:02 PM
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#1
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Member
Join Date: Jul 2011
Posts: 94
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Coolant Hose Leak
Hello All,
I'm new to this forum and am glad to have found you!
I have an '04 Newmar MountainAire DP on a Mountain Master tag chassis.
A few days ago I had an emrgency engine shutoff due to engine overheating. The mobile mechanic found the coolant hose going from the pump to the dash heater with a 2" long stress fracture.
Is that normal for a 7 year old rig, and how do you replace 45' of hose (the mechanic's suggestion), running along the underside of the coach without tearing the whole basement apart?
Thank you in advance for your replies and or tips,
Thomas
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07-02-2011, 08:09 PM
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#2
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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Sadly, 7 years is not an unusual failure time for domestic hoses. No reason for it, since most Honda and Toyota hose goes 15 to 20 years without failure.
You do have the option of running the new hose in a more accessble area - such as along the inside of the frame rails - and just abandoning the old hose. This can save a lot of time/money.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012
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07-02-2011, 11:52 PM
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#3
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Member
Join Date: Jul 2011
Posts: 94
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That's just it. The current one DOES run within the "U" channel, but it keeps disappearing in the frame somewhere and then swoops out at some other end. And the rails in the basement have a hard plastic cover "conduit" where all the wires and hoses are hidden. So, pulling out he old one is the hard part. i just don't understand why they would use such a soft, cheap hose for this application to begin with.
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07-03-2011, 10:50 AM
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#4
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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It's all about price. Good quality 5/8" silicone hose is $120 for 25 feet at Grainger. I think it's worth it, but the concept is lost to the bean counters at the factory.
My dream for a special hell for cost-cutting fanatics:
Perpetual failures of everything they ever price chopped.
My dream for bad engineers:
Eternally trying to replace the impossible-to-get-at parts that they designed.
As for politicians............................
Well, I don't want to get banned.
__________________
2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
Yellowstone Lake 6-1-2012
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07-07-2011, 04:41 PM
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#5
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Member
Join Date: Jul 2011
Posts: 94
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All it says on the side of the hose is " 5/8" standard heater hose, so I don't know the brand. Since the hose DID break right at a section that did NOT have a wire wrapper around I'm suspecting that's why it failed
Thomas
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07-07-2011, 11:55 PM
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#6
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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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What coolant are you using? Some coolants have 2-ethyl hexanoic acid in them that attacks the hoses, causing them to fail although it's the silicon or silicone lined ones that it eats up.
Here's a thread that discusses it.
__________________
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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07-09-2011, 04:46 AM
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#7
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Senior Member
Join Date: Aug 2006
Location: Fulltiming
Posts: 176
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Tom, I hope you are able to get this fixed at a reasonable cost. Please update us when you are done.
Anyone??? - for the MM and K2 chassis, has anyone found a reasonable solution for replacing the entire length of hose given the problem accessing the channel? I am OK for now but wondering what happens when that time comes to replace the hose.
The other hose I am concerned about it the engine to Hydro Hot (Aqua Hot) loop that provides hot water while driving. I have heard that one also has split from time to time.
Thanks
Ken
__________________
2005 41' Newmar Essex, CRV Toad
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07-12-2011, 05:43 PM
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#8
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Senior Member
Monaco Owners Club Newmar Owners Club
Join Date: Aug 2000
Location: little rock, ar
Posts: 498
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Just had my Aqua-Hot hoses replaced at the factory. It was about a 12 hour job. Left the old hose in as they could not get it out do to it being spray foamed in. They were barely able to squeeze in the new hose.
__________________
2007 Mountain Aire,2014 Mountain Aire
2016 King Aire,2020 Newmar Essex
2017 Ford Explorer toad
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06-02-2019, 05:43 AM
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#9
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Junior Member
Newmar Owners Club Spartan Chassis
Join Date: Nov 2016
Location: Wausau, WI
Posts: 21
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Another coolant hose failure
My 2004 MADP 4302 had a major coolant leak and engine overheat this week. I was able to get the hoses disconnected at the engine so it can be driven, but no HydroHot or dash heat. No One wants to tackle it. I called Newmar and they are booked till December.
Is there a way to re plumb this with all new lines and just abandon the old ones as the leak is behind or above the tanks in the basement?
Looking for the right answer so this doesn’t happen again.
__________________
Cal and Susan Sprik (fur: Lucie and Sophie)
2004 Newmar Mointain Aire DP
2012 Jeep Grand Cherokee Overland Summit
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06-02-2019, 08:36 AM
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#10
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Senior Member
Join Date: May 2017
Location: Metamora, MI
Posts: 5,525
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Yes, there is a way...since you found this old thread, I assume you read it.
Replace the hoses. It's a decent sized job. Hopefully you are a handy DIY'r to get the job done. Otherwise, pay for it.
It's not a rocket science job, it just takes some adeptness to wiggle in to all the areas to pull the hose thru.
If the hose failure was due to a hose routed incorrectly and rubbed thru, then possibly the rest of hose is OK. Consider putting a splice in place replacing as much of the hose as is easy, especially in the engine bay. Not the best answer, but better than nuthin.
__________________
2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
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