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05-11-2018, 04:54 PM
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#1
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Member
Tiffin Owners Club Fleetwood Owners Club Freightliner Owners Club
Join Date: Feb 2011
Location: St louis, MO
Posts: 63
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Cummins operating temperature
I have a 330 ISC Cummins It runs about 175° on flat ground. It runs about 180° on hills. In reading other threads it seems I am running a bit cool. I know cooler is better than the alternative but I wonder if I might get better fuel mileage if it was running at the proper temp. Thanks in advance.
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Dan Hopkins
05 Fleetwood Discovery 39L
2006 Honda CRV Toad
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05-11-2018, 05:00 PM
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#2
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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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Yep, a little cool. 185° is about right, that's whete my '02 USC ran as does my present ISX.
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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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05-11-2018, 05:07 PM
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#3
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Senior Member
Join Date: Nov 2005
Posts: 7,400
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...agree, 185 degrees is pretty common ops temp, higher on grades .....unlike my 2003 engine, noticed that the Pegasus engine [circa 2005] did seem to run a bit warmer, like 195.....cant say what the newer EGR and DEF Cummins engines run at.....and yup, cooler temps will/can hurt MPG....
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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05-11-2018, 05:30 PM
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#4
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Senior Member
Freightliner Owners Club
Join Date: Mar 2002
Location: Western WA
Posts: 1,294
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195 degrees. Keep your radiator clean.
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Sold the Motorhome, joined the fully retired gang. '07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X, Blue Ox, Aventa
US Gear UBS
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05-11-2018, 06:01 PM
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#5
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Senior Member
Tiffin Owners Club
Join Date: Nov 2011
Location: Foley, AL
Posts: 1,093
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My 2017 380ISL runs about 190-195 normally.
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Les & Pam Warden
(Tiffin) 2017 Phaeton 40QBH; 2023 Wayfarer 25RW (coming soon)
2016 Jeep JKUS with Ready Brute Elite towbar
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05-11-2018, 06:28 PM
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#6
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Senior Member
Join Date: May 2016
Location: St. Maries, Idaho
Posts: 959
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I run between 185 and 205. Normal cruising about 195. You might have a bad thermostat or bad cooling fan (fan locked up). I had this problem and was fixed by replacing the fan controller. I think you have a rear radiator, so it’s not the same setup as mine.
Bill
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2003 Country Coach Intrigue 36'
Cummins ISL 400
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05-12-2018, 12:11 PM
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#7
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Senior Member
Join Date: Jul 2017
Posts: 164
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5.9 ISB overheating
Kinda new to the DP world. One thing that seems to be a common problem is overheating when going up hills. Mine does this, and I've tried down shifting, going slower, keeping rpm's around 2200, cleaning CAC/radiator. Nothing seems to work for long hills. Has anyone explored rigging a nozzle to spray water between the fan and CAC?
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2000 Damon Ultrasport 3670
DP Cummins 5.9
Tow Dolly, 06 GMC Envoy
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05-12-2018, 01:40 PM
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#8
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Senior Member
Join Date: Jul 2014
Posts: 35,441
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Quote:
Originally Posted by OCM
Kinda new to the DP world. One thing that seems to be a common problem is overheating when going up hills. Mine does this, and I've tried down shifting, going slower, keeping rpm's around 2200, cleaning CAC/radiator. Nothing seems to work for long hills. Has anyone explored rigging a nozzle to spray water between the fan and CAC?
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I can't imagine that your MH overheated since new.
You may have a bad radatior. Over time corrosion builds up inside the tubes insulating the hot coolant from the air flowing by.
Unless you can see the inner core tubes, its not easy to diagnose.
Spraying water on it isn't a fix.
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05-12-2018, 05:41 PM
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#9
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Senior Member
Join Date: Jul 2017
Posts: 164
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I'm the 3rd owner of the 2000 Damon Ultrasport, the last owner said that she (traveling nurse) had that problem too. I've cleaned the CAC/radiator, but can't see if it's "clean". How big a job is pulling them out? Can a DIY'er tackle it?
It only does this on long hills, after on the road a couple of hours. As soon as I back off temps drop. Here in the mtns it is very aggravating.
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2000 Damon Ultrasport 3670
DP Cummins 5.9
Tow Dolly, 06 GMC Envoy
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05-12-2018, 09:33 PM
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#10
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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The standard thermostat in the ISC is 180 degrees. Mine runs 178 to 180 on the flats.
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Dennis and Katherine
2000 Monaco Dynasty
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05-14-2018, 09:45 AM
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#11
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Senior Member
Texas Boomers Club Holiday Rambler Owners Club
Join Date: Jun 2002
Location: What? Like right now? ;-)
Posts: 1,302
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My side rad 350 runs 178-180 on VMSpc and will go to 190 on big hills. But thats where I like it. Well away from any thermal issues
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2003 Scepter 40PDBB - Roadmaster RR8S - Cummins ISC350 - purch aug16
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