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Overheating Allure

Yahoo Message Number: 80915
2006 34' Allure w/400 hp Cummins overheating to 225 degrees up Baker grade towards Las Vegas a week ago. Stopped and cooled down to 200 before starting out again for a couple of miles, then pull over, cool down etc. Coach has 2 year old Radiator Supply House copper and steel radiator and new charge air cooler installed by Premier in Junction City. New thermostat 3 months ago. Ended up at Freightliner in North Las Vegas in 116 degree heat for a couple of days. They diagnosed problem as software issue where computer is telling fan to run on high when coolant is cold, and to run on low when coolant is hot. Supposedly fan controller and sensors check out as ok. I test drove coach with tech after software was up-dated and fan commands reversed to cool/low speed, hot/high speed and heading north on I-15 past Las Vegas Speedway temp only went to 204 degrees on grade. I was optimistic; but guarded, so we cancelled our plans to head for Idaho and Montana and returned to Newport Beach flat towing a Honda Element. Coach overheated to 225 coming up long grade out of Stateline, pulled over at 4,000 foot elevation for cool-down, and proceeded. I had changed my driving so as to slow down on grades, and downshift to 5th, then to 4th to hold rpm's at around 2,000 - 2,200; but I think the computer reverted to its old settings. Outside temperature was cooling down by the time we got to the southbound side of the Cajon Pass, and we went over it at about 201 degrees, and ran in the mid 180's on the flat on the 91 Freeway in the cool rain into Orange County.
Have an appointment at Colton Truck Repair next week for further diagnosis; but thought I'd throw the subject out and see if anyone has had a similar experience that may shed some light on fixing my problem.
Freightliner was helpful getting us in for service, and had me sign the service ticket and leave without paying so we could see if the fix worked. I called the Service Manager when we got home and reported that the problem was not fixed, and he graciously split the bill with me, even thought the tech had expended the hours on diagnosis and test drives. I thought that was more than fair, and would return to Freightliner if the need ever arises in the future.
Also, there is a "pet friendly" Best Western hotel just down the street from Freightliner in North Las Vegas.

Look forward to your comments, Thanks.

Jim Westling

2006 Allure 34' #31400

Re: Overheating Allure

Reply #1 –
Yahoo Message Number: 80917
Pull the multi-pin plug to the fan controller at the rear of the radiator, leave the two pin plug connected.

This will force the fan to the high speed mode keeping your engine cool until you can get to a service

center. Will kick up some dust and cost you up to 1 mpg of fuel, but you won't have to worry about

overheating.
TWI 2004 Intrigue 11731
2006 34' Allure w/400 hp Cummins overheating to 225 degrees up Baker grade towards Las Vegas a

week ago. Stopped and cooled down to 200 before starting out again for a couple of miles, then pull

over, cool down etc. Coach has 2 year old Radiator Supply House copper and steel radiator and new

charge air cooler installed by Premier in Junction City. New thermostat 3 months ago. Ended up at

Freightliner in North Las Vegas in 116 degree heat for a couple of days.
They diagnosed problem as

software issue where computer is telling fan to run on high when coolant is cold, and to run on low

when coolant is hot. Supposedly fan controller and sensors check out as ok. I test drove coach with

tech after software was up-dated and fan commands reversed to cool/low speed, hot/high speed and

heading north on I-15 past Las Vegas Speedway temp only went to 204 degrees on grade. I was

optimistic; but guarded, so we cancelled our plans to head for Idaho and Montana and returned to

Newport Beach flat towing a Honda Element. Coach overheated to 225 coming up long grade out of

Stateline, pulled over at 4,000 foot elevation for cool-down, and proceeded. I had changed my driving so as to slow down on grades, and downshift to 5th, then to 4th to hold rpm's at around 2,000 - 2,200;

but I think the computer reverted to its old settings. Outside temperature was cooling down by the time

we got to the southbound side of the Cajon Pass, and we went over it at about 201 degrees, and ran in

the mid 180's on the flat on the 91 Freeway in the cool rain into Orange County.

Have an appointment at Colton Truck Repair next week for further diagnosis; but thought I'd throw the

subject out and see if anyone has had a similar experience that may shed some light on fixing my
problem.

Freightliner was helpful getting us in for service, and had me sign the service ticket and leave without

paying so we could see if the fix worked. I called the Service Manager when we got home and reported

that the problem was not fixed, and he graciously split the bill with me, even thought the tech had

expended the hours on diagnosis and test drives. I thought that was more than fair, and would return

to Freightliner if the need ever arises in the future.
Also, there is a "pet friendly" Best Western hotel just down the street from Freightliner in North Las
Vegas.

Look forward to your comments, Thanks.

Jim Westling

2006 Allure 34' #31400

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Re: Overheating Allure

Reply #2 –
Yahoo Message Number: 80924
You should not have sensors for the controller the ECM does the control on an 06 400ISL. Bob 06 intrigue 12047

Re: Overheating Allure

Reply #3 –
Yahoo Message Number: 80926
Hi Jim,

In my 28 yrs. of driving, going up the Baker grade towing will always cause overheating. I downshift to 5th AND again to 4th to maintain my rpm's. There ways one time I even had to open my engine doors. Sounds normal to me.

Michael

05 Inspire #51381

**************************************** Michael Title

Halfmoon Bay, BC, Canada
CDN Cell: 604.741.3328

San Miguel De Allende, GTO Mexico MEX Cell: [52] 415.100.1543

Re: Overheating Allure

Reply #4 –
Yahoo Message Number: 80927
Don't want to stir the pot too much , but 225Deg water temp on a 90 to 100 deg outside temperature , climbing a grade is not really OVERHEATING , in my view. With a 7 PSI pressure cap, the boiling point of water only, would be around 250 to 260 and even higher with glycol. I do not worry unless I see 240 consistently, using 100 degree air over the radiator. Also , I would suggest stopping is the answer to cooling off the engine. When stopped the water/glycol is not being moved around the system. The better bet to stopping is to move along at light load, say 1300 RPM and on a somewhat level road , so that the boost and fuel burn is kept low. If there is a fan control problem, that is a separate issue. If your engine was able to keep the water temp at 225, at low fan , the system certainly can handle the load.

Ron Baran 09 Magna 7025

Re: Overheating Allure

Reply #5 –
Yahoo Message Number: 80946
I agree. I have had 220 degrees on my little 300 hp Cummins several times over 10 years in high temp steep grade situations. However, the engine is programmed to shut down at 225 degrees.

And it will shut down!

Dean

95 Magna 5280

Coolant Pressure Cap

Reply #6 –
Yahoo Message Number: 80947
Greetings campers,

Ron mentions a 7 PSI pressure cap. My system has a 16 PSI (original) cap.
What pressure is specified for the C9? Does it vary with engine/application?
Has anyone added a coolant recovery bottle at the bottom of the overpressure tube?

Just curious.

Thanks.
Jay

05 Inspire 51457

Re: Coolant Pressure Cap

Reply #7 –
Yahoo Message Number: 80948
Jay there have been a few posts in the past, and I remember seeing 7PSi as being required on that coach. Without going to look at mine , I believe it is 15 PSI. The only reason , I mentioned 7 PSi , was that that is the lowest I had heard. The point , I was trying to make was that , the boiling point goes UP , the higher the pressure. Therefore 225 deg is not all that high. Some one posted that the engine Shuts Down at 225. My ISX restricts fuel flow at 240, but does not shut down.I would guess that true- shut down - would be somewhat higher than that. By restricting fuel flow, you reduce power , and don't generate as much heat.

Ron Baran 09 Magna 7025
 

Re: Overheating Allure

Reply #8 –
Yahoo Message Number: 80970
Jay Working at Cat on our in house power systems with Cat made Radiators 3/7 psi is the norm. The C-9 Being a workhorse 7 may be the ticket, Years back Cat raised Jacket Temps for Emissions and a lot of HP and Power is there in the C-9, Don't go to High as Its only a Patch. I Believe on newer CC"s the Radiators are Marginal. Call the Cat Help Line. They can put more on the table for you. Ken retired Cat Tech.