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04-24-2011, 08:37 PM
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#1
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Senior Member
Join Date: Jul 2009
Posts: 2,864
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Cummins Coolant Leak?
Our coach is 18 months old. I have put about 2 gallons of coolant in the engine coolant reservoir in that time. No visible signs of leaks. Is this unusual? Based on my other personal vehicles I think this is excessive. Is there a leak somewhere that is burning off?
Don
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04-24-2011, 08:50 PM
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#2
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Senior Member
Forest River Owners Club
Join Date: Aug 2002
Location: ...East Texas
Posts: 5,325
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I find I have to add some to mine from time to time ...and when it was 2-3 years old found some drips and had to tighten several clamps...
__________________
Paul (KE5LXU) ...was fulltimin', now parttimin'
2022 Coachmen Leprechaun 319MB
towing 2017 Jeep Grand Cherokee Limited
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04-24-2011, 08:55 PM
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#3
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Senior Member
Newmar Owners Club
Join Date: Aug 2007
Location: Belfair WA.
Posts: 777
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I had something similiar on my ISB, was experiencing a small loss of coolant over time for a couple of years but could not find a leak, or evidence of a leak, but didn't check this area because I didn't realize that engine coolant supplied this component. What it turned out to be was a bad hose that supplies coolant to the Air Compressor. Hose had a small leak at the 90 just before entering the air compressor. Cummins said it was an unusual occurrence but happens. Found mine after 60 mile tow to Cummins NW after a loss of coolant was experienced. Might be a place to check. Since having it repaired have not added any coolant.
Spike
__________________
"Those who stand for nothing fall for anything"
2020 Dutch Star - 3736 - L9 450HP, Freightliner
2008 Newmar VTDP - 3330 - ISBXT 350 Spartan NVS
FMCA F113720, NKK 18573
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04-24-2011, 10:29 PM
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#4
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Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Kitts Hill, OH
Posts: 2,252
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I have had many vehicles that have went 2-3 years without a coolant loss.
What you are seeing is NOT normal. To me that would NOT be acceptable.
__________________
(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
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04-25-2011, 06:53 AM
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#5
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Senior Member
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 13,599
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Hi akadeadeye,
For me, your situation is not normal. The only time I add coolant is after I've replaced the coolant and the system "burps" out air. Once that is complete, no coolant is ever added. Finding the leak will, most likely, take a professional. The leak could be anywhere.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
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04-25-2011, 07:22 AM
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#6
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Registered User
Excel Owners Club Retired Fire Service RVer's
Join Date: Nov 2010
Location: Farmington NM
Posts: 1,822
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On the right side rear of the engine look for a steel heater pipe that is joined (for movement) by about a 3" rubber hose coupler. These are notoroious for weeping. Have it replaced with good clamps don't over tighten.
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04-25-2011, 08:56 AM
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#7
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Junior Member
Join Date: Feb 2011
Posts: 8
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I had a similar problem after I bought my new 2007 Dutch Star. Look under the hot water heater and see if the carpet is wet. Also along the line that feeds the dash air. I went thru over 2 gallons of antifreeze before Cummins found the problem was in the line going around the hot water heater.
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04-25-2011, 09:01 AM
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#8
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Registered User
Join Date: Mar 2011
Posts: 1,943
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Check the squeeze clamps on the back of your Aqua or Hydro Hot if you have one.
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04-25-2011, 10:02 AM
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#9
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Senior Member
Join Date: Jul 2009
Posts: 2,864
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Thanks for all the suggestions. I think a trip to Cummins Southplains is in order.
Don
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04-25-2011, 05:27 PM
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#10
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Senior Member
Newmar Owners Club
Join Date: Aug 2007
Location: Belfair WA.
Posts: 777
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Probably a good plan Don, have a feeling if you don't you would get there sooner or later, but maybe on the working end of a tow truck.
Spike
__________________
"Those who stand for nothing fall for anything"
2020 Dutch Star - 3736 - L9 450HP, Freightliner
2008 Newmar VTDP - 3330 - ISBXT 350 Spartan NVS
FMCA F113720, NKK 18573
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04-25-2011, 07:28 PM
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#11
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Senior Member
Newmar Owners Club
Join Date: Jul 2006
Posts: 1,122
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They will pressurize the coolant system when the engine is cool and visually check for leaks. Newmar has had issues with the connections at the front of the coach going to the heater core
__________________
John, Pam, and Aria
NKK 16073L
2015 London Aire
2015 GMC Seirra
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05-01-2011, 03:03 PM
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#12
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Junior Member
Join Date: Apr 2011
Posts: 6
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Have a 2008 London Aire with an ISX 600 (built March 2007) and the RGA went out losing about 1 gallon per 300 miles. Fortunately the 5 year warranty applied and the $ 3,600.00 repair was paid by Cummins.
Great engine but some issues with the sub-vendor to Cummins that built all RGA units. All work to replace was down thru the bedroom floor access door. 3 day lost, the good news, in Portland in Summer 2010 and it was beautiful.
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