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ISL 400 hp overheating problem
08-06-2011, 07:21 PM
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#1
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Junior Member
Join Date: Jul 2009
Posts: 10
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We have a 2006 Itasca Horizon with a 400 HP Cummins ISL Turbo Diesel. It overheats in summer conditions far more than I would like. We find ourselves downshifting to as low as second gear to keep the RPM's above 2000 and the temperature below 220, which means we're traveling on I-70 in the mountains at about 30 MPH, which is a drag.
Is it possible to install a larger radiator to keep the engine better cooled?
Erik and Anne
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08-06-2011, 07:22 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Apr 2009
Location: Granbury, Texas
Posts: 912
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Have you thoroughly cleaned the radiator fins, i.e. the outside of the radiator?
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Ronnie (WD5GIC) & Jan (WD5IHU)
2003 Monaco Dynasty Countess 42' w/tag, 2008 Ford Escape Hybrid
http://www.ronniesphotos.com
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08-06-2011, 07:46 PM
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#3
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Senior Member
Join Date: Aug 2006
Posts: 799
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Your radiator is designed to run at the proper temperatures so I would look for a problem. It could be a dirty radiator, a cooling fan that is not working, a stuck thermostat or other problem.
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2005 Dutch Star 4015
Cummins ISL
2007 Honda CR-V
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08-06-2011, 08:11 PM
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#4
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Senior Member
Freightliner Owners Club
Join Date: Aug 2008
Location: New Jersey
Posts: 1,216
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I clean my ISL 400hp at least once a year. You'd be surprised at the amount of grime that comes off.
Spray Simple Green on the radiator and then rinse off.
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Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
RVing for 14 years with three boys
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08-07-2011, 06:24 AM
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#5
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Senior Member
Join Date: Jan 2009
Location: Somewhere on the road
Posts: 227
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We have the same engine in our 06 Endeavor but have the Horton electric two speed fan installed on ours. The fan is silent and not running until the temp gets to 220 degrees and then it kick on and cools the engine down to around 180. There are days we drive and the fan never comes on, especially when the temps are lower ourside. There are a lot of folks with the Monaco products that have the Horton fan and love it. The other good thing is the noise factor of not hearing the roaring of the engine fan all of the time.
Bill O.
06 endeavor
Horton two speed fan 
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Bill O'Dell,Retired U.S. Army, Retired LEO, 100%VA, 2006 HR Endeavor PDQ, Harley Ultra Clasic with Tow-Pac 2009 Chevrolet Silverado 4x4 Crew cab,
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08-07-2011, 02:33 PM
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#6
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Senior Member
Join Date: May 2006
Location: Central Florida
Posts: 620
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Is it possible to install a Horton Fan on a side radiator cooling setup? The side radiator cooling fan on a Freightliner chassis is also temperature controlled through the variable hydraulic fan drive motor. Was that disabled or does the Monaco chassis have a different setup from Winnebago.
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Harry
2005 Itasca Horizon 40KD
2006 Honda CR-V
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08-07-2011, 02:48 PM
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#7
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Senior Member
Join Date: Jan 2009
Location: Somewhere on the road
Posts: 227
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Harry B,
I don't have a clue whether it will work on the side mount radiator or not. Not being a mechanic I would be affraid to try and answer. I would call cummins.
Bill O.
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Bill O'Dell,Retired U.S. Army, Retired LEO, 100%VA, 2006 HR Endeavor PDQ, Harley Ultra Clasic with Tow-Pac 2009 Chevrolet Silverado 4x4 Crew cab,
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08-08-2011, 08:21 AM
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#8
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Senior Member
Join Date: Aug 2011
Posts: 489
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Bad question I know but the hydraulic fan is running during this time? My father had about 3k worth of parts and labor in his, thankfully his defaulted to full speed fan.
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2011 F350 Lariat Diesel Dually, White, Hitch Kit.
2011 Forest River Wildwood Sport 32SRV 5th wheel.
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08-08-2011, 09:54 AM
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#9
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Senior Member
Join Date: Jan 2009
Location: Somewhere on the road
Posts: 227
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I'm pretty sure that when the Horton fan is installed and in place the regular stock fan is discontinued and will not run.
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Bill O'Dell,Retired U.S. Army, Retired LEO, 100%VA, 2006 HR Endeavor PDQ, Harley Ultra Clasic with Tow-Pac 2009 Chevrolet Silverado 4x4 Crew cab,
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08-08-2011, 06:38 PM
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#10
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Junior Member
Join Date: Jul 2005
Location: Buffalo Grove, IL
Posts: 13
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We have the same unit and experienced the same problem this past July. Cleaning the side radiator didn't seem to help much. I'm watching for suggestions to have our Freightliner Service Center check.
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Nancy, Hank & Toudy the black & white cat
06 Horizon KD
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