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Overheating Cummins 400 ISL

Yahoo Message Number: 34584
My 06 Cummins 400 ISL has climbed mountain passes from the West Coast to the East Coast and most of the 10,000 ft. and up passes of Colorado for two summers with no problems, however, this last summer while climbing two long passes in Colorado it started heating up. Both times it was a long climb up I-70 (Eisenhower Tunnel, Loveland Pass area) above 10,000 feet and the temp reached 228 plus. On one side of the mountain during one climb the warning light came on and the engine shut down approximately 300 feet from the tunnel. I was able to safely pull over and let it cool and everything was ok from then on. It would have been a disaster had it shut down in the tunnel. The coach normally runs on flat ground, 70-80 degrees, at a temp of about 200 degrees, however if I turn on the dash air, the temp will drop to about 180-185. . I talked to CC and they said that when I turn on the dash air that the Fan Speed Control Module automatically kicks the fan speed to medium when it has probably been running in low. This causes the temp drop. They also said that when I reached a certain temp (I forgot what temp) that the fan should kick on to medium or to high, according to the engine temp. They said that my climbing high temp problem sounded like the Fan Speed Control Module was not kicking the fan into high and thus causing the overheat problem. They also told me I could go out under the coach and unplug the module and the fan would automatically run on high all the time. They said I could do this while in the mountains if I wanted to until I got somewhere to get the Fan Module checked. Has anyone had this problem? I'm going to a CC Texans Rally next week and hope to get the Techs to check the Module, but I'm not sure they will be able to out of the shop. Any thoughts would be appreciated? Coolant level is perfect.

R. D. Vanderslice
06 Allure 470 - 31294

Re: Overheating Cummins 400 ISL

Reply #1 –
Yahoo Message Number: 34587
I had the opposite problem with my 2004 Inspire. The fan control module had the fan running on high all the time. CC would not send a replacement; instead they required the module be removed and sent to them for reprograming. This took over a month. With the module removed, the fan ran on high and the engine was not very efficient at 160 degrees. After the reprogramming, all was well. I might add they claimed there was no replacement part available for this module and the only possible "fix" was the reprogramming.

Bob Mussman
2006 Allure 470

Quote from: R\. D\. Vanderslice
>

My 06 Cummins 400 ISL has climbed mountain passes from the West
Coast to the East Coast and most of the 10,000 ft. and up passes of Colorado for two summers with no problems, however, this last summer while climbing two long passes in Colorado it started heating up.
Both times it was a long climb up I-70 (Eisenhower Tunnel, Loveland Pass area) above 10,000 feet and the temp reached 228 plus. On one side of the mountain during one climb the warning light came on and the engine shut down approximately 300 feet from the tunnel. I was able to safely pull over and let it cool and everything was ok from then on. It would have been a disaster had it shut down in the tunnel. The coach normally runs on flat ground, 70-80 degrees, at a temp of about 200 degrees, however if I turn on the dash air, the temp will drop to about 180-185. . I talked to CC and they said that when I turn on the dash air that the Fan Speed Control Module automatically kicks the fan speed to medium when
Quote
it has probably been running in low. This causes the temp
drop. They also said that when I reached a certain temp (I forgot what temp) that the fan should kick on to medium or to high, according to the engine temp. They said that my climbing high temp problem sounded like the Fan Speed Control Module was not kicking the fan into high and thus causing the overheat problem. They also told me I could go out under the coach and unplug the module and the fan would automatically run on high all the time. They said I could do this while in the mountains if I wanted to until I got somewhere to get the Fan Module checked. Has anyone had this problem? I'm going to a CC Texans Rally next week and hope to get the Techs to check the Module, but I'm not sure they will be able to out of the shop. Any thoughts would be appreciated? Coolant level is perfect.

Re: Overheating Cummins 400 ISL

Reply #2 –
Yahoo Message Number: 34599
QUOTE: They also told me I could go out under the coach and unplug the module and the fan would automatically run on high all the time.
END QUOTE.

I'm told that you can also pull out the fuse for the fan in the outside electrical bay under the driver's seat to achieve the same results.

Larry 03 Allure 30856

Quote from: motorhomecatz
>

I had the opposite problem with my 2004 Inspire. The fan control > module had the fan running on high all the time. CC would not send

a

Quote
replacement; instead they required the module be removed and sent

to

Quote
them for reprograming. This took over a month. With the module > removed, the fan ran on high and the engine was not very efficient

at

Quote
160 degrees. After the reprogramming, all was well. I might add

they

Quote
claimed there was no replacement part available for this module and > the only possible "fix" was the reprogramming.

Bob Mussman
2006 Allure 470

[quote author=R. D. Vanderslice"

>

> My 06 Cummins 400 ISL has climbed mountain passes from the West > Coast to the East Coast and most of the 10,000 ft. and up passes of > Colorado for two summers with no problems, however, this last

summer

Quote
while climbing two long passes in Colorado it started heating up.
Both times it was a long climb up I-70 (Eisenhower Tunnel, Loveland > Pass area) above 10,000 feet and the temp reached 228 plus. On one > side of the mountain during one climb the warning light came on and > the engine shut down approximately 300 feet from the tunnel. I was > able to safely pull over and let it cool and everything was ok from > then on. It would have been a disaster had it shut down in the > tunnel. The coach normally runs on flat ground, 70-80 degrees, at

a

Quote
temp of about 200 degrees, however if I turn on the dash air, the > temp will drop to about 180-185. . I talked to CC and they said > that when I turn on the dash air that the Fan Speed Control Module > automatically kicks the fan speed to medium when > > it has probably been running in low. This causes the temp > drop. They also said that when I reached a certain temp (I

forgot

Quote
what temp) that the fan should kick on to medium or to high, > according to the engine temp. They said that my climbing high temp > problem sounded like the Fan Speed Control Module was not kicking

the

Quote
fan into high and thus causing the overheat problem. They also told > me I could go out under the coach and unplug the module and the fan > would automatically run on high all the time. They said I could do > this while in the mountains if I wanted to until I got somewhere to > get the Fan Module checked. Has anyone had this problem? I'm

going

Quote
to a CC Texans Rally next week and hope to get the Techs to check

the

Re: Overheating Cummins 400 ISL

Reply #3 –
Yahoo Message Number: 34606
Larry, that would be a whole lot better that laying under the back wheels of a motorcoach on the side of a mountain with the front end pointing straight up the mountain, the engine at 230 degrees and cars going by at 75 mph. Not my idea of a safe situation. I hope to have the situation resolved before I hit the mountains again next year, but I will ask the Techs next week about that and get them to show me the fuse, just in case it happens again. Thanks for your input.

R. D. Vanderslice
06 Allure 31294

Re: Overheating Cummins 400 ISL

Reply #4 –
Yahoo Message Number: 34608
Bob, at least it is good to know that it can be reprogrammed. The tech I got on the phone told me that it could be replaced, but that it was about $500.00. I like the reprogramming idea better. What do you mean "the engine was not very efficient at 160 degrees"?. Thanks for your help, I really appreciate it.

R. D. Vanderslice
06 Allure 31294
P.S.

If I seem like a motormouth this morning it's because it is raining here in Rockwall, Texas and I can't do my 5 mile run yet. I guess I'm just too full of energy and have a little too much time this morning. Sorry.

.

Re: Overheating Cummins 400 ISL

Reply #5 –
Yahoo Message Number: 34611
Another way in the future is to install a switch in the electrical bay that allows you to open the circuit, thereby allowing the fan to go to Hi.

Jim & Kim Hill

08 Tribute 260 81138 (still in the production line) 08 Cummins ISL 425

06 Ford F250 Super Duty Diesel Toad

Re: Overheating Cummins 400 ISL

Reply #6 –
Yahoo Message Number: 34612
The diesel engine needs to run hotter than 160 to be efficient. Poor fuel mileage and less power. Not to mention the fan roaring constantly.

Bob Mussman
2006 Allure

Quote from: R\. D\. Vanderslice
>

Bob, at least it is good to know that it can be reprogrammed. The
tech I got on the phone told me that it could be replaced, but that it was about $500.00. I like the reprogramming idea better. What do you mean "the engine was not very efficient at 160 degrees"?. Thanks for your help, I really appreciate it.

Quote
R. D. Vanderslice
 06 Allure 31294

P.S.

If I seem like a motormouth this morning it's because it is
raining here in Rockwall, Texas and I can't do my 5 mile run yet. I guess I'm just too full of energy and have a little too much time this morning. Sorry.

Quote
>

. motorhomecatz wrote:

I had the opposite problem with my 2004 Inspire. The fan

control

Quote
module had the fan running on high all the time. CC would not send

a

Quote
replacement; instead they required the module be removed and sent

to

Quote
them for reprograming. This took over a month. With the module > removed, the fan ran on high and the engine was not very efficient

at

Quote
160 degrees. After the reprogramming, all was well. I might add

they

Quote
claimed there was no replacement part available for this module and > the only possible "fix" was the reprogramming.

Bob Mussman
2006 Allure 470

[quote author=R. D. Vanderslice"

>

> My 06 Cummins 400 ISL has climbed mountain passes from the West > Coast to the East Coast and most of the 10,000 ft. and up passes of > Colorado for two summers with no problems, however, this last

summer

Quote
while climbing two long passes in Colorado it started heating up.
Both times it was a long climb up I-70 (Eisenhower Tunnel, Loveland > Pass area) above 10,000 feet and the temp reached 228 plus. On one > side of the mountain during one climb the warning light came on and > the engine shut down approximately 300 feet from the tunnel. I was > able to safely pull over and let it cool and everything was ok from > then on. It would have been a disaster had it shut down in the > tunnel. The coach normally runs on flat ground, 70-80 degrees, at a > temp of about 200 degrees, however if I turn on the dash air, the > temp will drop to about 180-185. . I talked to CC and they said > that when I turn on the dash air that the Fan Speed Control Module > automatically kicks the fan speed to medium when > > it has probably been running in low. This causes the temp > drop. They also said that when I reached a certain temp (I forgot > what temp) that the fan should kick on to medium or to high, > according to the engine temp. They said that my climbing high temp > problem sounded like the Fan Speed Control Module was not kicking

the

Quote
fan into high and thus causing the overheat problem. They also told > me I could go out under the coach and unplug the module and the fan > would automatically run on high all the time. They said I could do > this while in the mountains if I wanted to until I got somewhere to > get the Fan Module checked. Has anyone had this problem? I'm going > to a CC Texans Rally next week and hope to get the Techs to check

the

Re: Overheating Cummins 400 ISL

Reply #7 –
Yahoo Message Number: 34615
That's what I thought, just wanted to make sure I wasn't missing something. I was told also to be careful pulling into a gravel road campground with the fan running in high because a dust storm would surely be created and some people would probably be a little unhappy. Thanks agian Bob.

R. D. Vanderslice
06 Allure 31294

Re: Overheating Cummins 400 ISL

Reply #8 –
Yahoo Message Number: 34616
Another good idea. Surely, the Module can be reprogrammed or replaced though, if that is the problem. I'm going for that first. Thanks Jim.

R. D. Vanderslice
06 Allure 31294

Re: Overheating Cummins 400 ISL

Reply #9 –
Yahoo Message Number: 34617
Quote from: R\. D\. Vanderslice
>

That's what I thought, just wanted to make sure I wasn't missing
something. I was told also to be careful pulling into a gravel road campground with the fan running in high because a dust storm would surely be created and some people would probably be a little unhappy.
Thanks agian Bob.

Quote
R. D. Vanderslice
 06 Allure 31294
> Unless you have the radiator fan deflector installed. I did this and
as far as I can tell so far, it has eliminated the dust storm problem.

Larry 03 Allure 30856>

Re: Overheating Cummins 400 ISL

Reply #10 –
Yahoo Message Number: 34622
I just went thru this , my fan would come on at different temps 173 on and off at 170 ect, then later in the day work like properly. I did the test to see what was wrong, found the controller needed re-programming. Sent it in last month and they said it was bad. They sent me a new one for $435.00. I installed it and it works great now. If you do the test yourself you will need a laser RPM gauge John 04 31060

Re: Overheating Cummins 400 ISL

Reply #11 –
Yahoo Message Number: 34626
Thanks John. I'm hoping the Techs from Buddy Gregg will have the laser RPM gauge or what ever else they need to test it with them next week when I am at the CC Texans Rally. I don't have one. If they don't have the tools needed with them I may take it off and send it to the factory for testing. I have one more trip planned after I get back from the Rally, but will be back from that trip by mid November and won't need the coach for several months, so I will have plenty of time from then on to get it figured it out. It's good to know they have replacements available, although I don't like the price.

R. D. Vanderslice
06 Allure 31294

Re: Overheating Cummins 400 ISL

Reply #12 –
Yahoo Message Number: 34655
Same fan control is also used with other engines. Fan controller troubles were well discussed years ago on this list. Some were cured by cleaning electric terminals on controller & plug then protecting with grease or electric contact protective spray. I use CorrosionX on all electric connections. Other products will do.

Eric Lee Elliott

Re: Overheating Cummins 400 ISL

Reply #13 –
Yahoo Message Number: 34691
Eric,

Where have you found Corrosion X? I haven't been able to find it anywhere.

Thanks,
Brad Ward

2000 Magna 5916

Quote from: Eric Lee Elliott\[br\
] >

Same fan control is also used with other engines. Fan controller > troubles were well discussed years ago on this list. Some were cured

by

Re: Overheating Cummins 400 ISL

Reply #15 –
Yahoo Message Number: 34698
In this mornings' email.

Dave

2000 Allure 36'
#30444

Special offer only available at http://www.rejex.com
Questions? Comments?? Feel free to contact us at jdhill@...
Masthead Marketing and Distribution 3030 Canton St. Dallas , TX 75226 214.651.8627, M-F, 9 a.m. to 5 p.m. CST

sno4us2 wrote:

Re: Overheating Cummins 400 ISL

Reply #16 –
Yahoo Message Number: 34787
This is what I would do if I had this problem. Most 18 wheeler rigs have a switch on the dash that they can turn on fan manually or auto.
Another thing that I do is to gear down and back out of the accelerator and that cools engine down. Never had mine go over 210 degrees doing this on the same Colorado passes you are talking about.

Doug Hines
02 CC Allure

Quote from: Jim Hill
Another way in the future is to install a switch in the electrical

bay that

Quote
allows you to open the circuit, thereby allowing the fan to go to

Hi.

Quote
>

Jim & Kim Hill

08 Tribute 260 81138 (still in the production line) > 08 Cummins ISL 425

06 Ford F250 Super Duty Diesel Toad >

_____
> From: Country-Coach-Owners@yahoogroups.com > [mailto:Country-Coach-Owners@yahoogroups.com] On Behalf Of R. D.

Vanderslice

Quote
Sent: Wednesday, October 03, 2007 8:05 > To: Country-Coach-Owners@yahoogroups.com > Subject: Re: [Country-Coach-Owners] Re: Overheating Cummins 400 ISL >

Larry, that would be a whole lot better that laying under the back

wheels of

Quote
a motorcoach on the side of a mountain with the front end pointing

straight

Quote
up the mountain, the engine at 230 degrees and cars going by at 75

mph. Not

Quote
my idea of a safe situation. I hope to have the situation resolved

before I

Quote
hit the mountains again next year, but I will ask the Techs next

week about

Quote
that and get them to show me the fuse, just in case it happens

again.

Quote
Thanks for your input.
R. D. Vanderslice
06 Allure 31294

Larry Feather wrote:

QUOTE: They also told me I could go out under the coach and unplug > the module and the fan would automatically run on high all the

time.

Quote
END QUOTE.

I'm told that you can also pull out the fuse for the fan in the > outside electrical bay under the driver's seat to achieve the same > results.

Larry 03 Allure 30856

[quote author=motorhomecatz"

>

> I had the opposite problem with my 2004 Inspire. The fan control > > module had the fan running on high all the time. CC would not

send

Quote
a

> replacement; instead they required the module be removed and sent > to

> them for reprograming. This took over a month. With the module > > removed, the fan ran on high and the engine was not very

efficient

Quote
at

> 160 degrees. After the reprogramming, all was well. I might add > they

> claimed there was no replacement part available for this module

and

Quote
the only possible "fix" was the reprogramming.
>

> Bob Mussman
> 2006 Allure 470
>
>
>

[quote author=R. D. Vanderslice"
>]
> >

> > My 06 Cummins 400 ISL has climbed mountain passes from the West > > Coast to the East Coast and most of the 10,000 ft. and up passes

of

Quote
Colorado for two summers with no problems, however, this last > summer

> while climbing two long passes in Colorado it started heating up.
> Both times it was a long climb up I-70 (Eisenhower Tunnel,

Loveland

Quote
Pass area) above 10,000 feet and the temp reached 228 plus. On

one

Quote
side of the mountain during one climb the warning light came on

and

Quote
the engine shut down approximately 300 feet from the tunnel. I

was

Quote
able to safely pull over and let it cool and everything was ok

from

Quote
then on. It would have been a disaster had it shut down in the > > tunnel. The coach normally runs on flat ground, 70-80 degrees, at > a

> temp of about 200 degrees, however if I turn on the dash air, the > > temp will drop to about 180-185. . I talked to CC and they said > > that when I turn on the dash air that the Fan Speed Control

Module

Quote
automatically kicks the fan speed to medium when > > > it has probably been running in low. This causes the temp > > drop. They also said that when I reached a certain temp (I > forgot

> what temp) that the fan should kick on to medium or to high, > > according to the engine temp. They said that my climbing high

temp

Quote
problem sounded like the Fan Speed Control Module was not kicking > the

> fan into high and thus causing the overheat problem. They also

told

Quote
me I could go out under the coach and unplug the module and the

fan

Quote
would automatically run on high all the time. They said I could

do

Quote
this while in the mountains if I wanted to until I got somewhere

to

Quote
get the Fan Module checked. Has anyone had this problem? I'm > going

> to a CC Texans Rally next week and hope to get the Techs to check > the

> Module, but I'm not sure they will be able to out of the shop.

Any