Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 03-15-2014, 05:07 PM   #1
Junior Member
 
Freightliner Owners Club
Join Date: Dec 2011
Location: Nipomo, CA
Posts: 13
Cummins 400 ISL Overheating Problem

I have a 2011 Winnebago Tour 42QD on as Freightliner XL Chassis. Since new, I have experienced a periodic overheating problem usually associated with freeway driving and then pulling off into city traffic wherein the coach overheats to the point of engine shutdown. A couple of minutes cool down, restart and high idle usually puts me back on the road within 5 minutes but thereafter, depending on traffic, the same issue persists. An early venture to Cummins resulted in an opinion that there was a "bubble" in the original coolant level. Later, a Freightliner dealer charged me $1500 to remove non-existant material between the fan and radiator plus, at my insistence, replacement of the thermostat. Problem still exists. I can drive 400 miles steady on a freeway, pull off into the city, and the coach overheats shortly thereafter. Any one experiencing similar Cummins circumstances with this motor?
__________________

__________________
JLAppel is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-15-2014, 06:18 PM   #2
Member
 
Steve COH's Avatar
 
Join Date: Jul 2012
Location: Circleville, Ohio
Posts: 85
No, that is not right.

What temperature range do you see in normal driving? I'm asking to see if the fan is engaging as it should.

I had the fan engaging all the time when a wiring harness came unplugged, and although unlikely, I wonder if your fan controller could be keeping it off all the time.
__________________

__________________
2012 Winnebago Tour JD
2014 Chevy Tahoe
Steve COH is offline   Reply With Quote
Old 03-15-2014, 08:02 PM   #3
YC1
Senior Member
 
YC1's Avatar


 
Holiday Rambler Owners Club
Join Date: Jun 2011
Posts: 4,667
Side radiator or rear? If side, the fan may not be coming on properly.

I would change the thermostat again myself. Get your engine serial number and call Cummins to get the current model thermostat. A new thermostat can be defective or they may not have changed it. With the old one out put it in boiling water to see if it opens properly..

If you have a rear radiator have you cleaned it?
__________________
Myron & Deborah
08 HR Endeavor 40 SKQ
2012 Ford Edge Limited FWD 3.5L
Aluminator tow bar, Demco base plate
YC1 is offline   Reply With Quote
Old 03-15-2014, 08:20 PM   #4
Senior Member
 
HicksRA's Avatar
 
Join Date: Mar 2013
Location: Fort Worth TX
Posts: 845
If you have a rear radiator with a clutch fan, I'd have the clutch checked.
__________________
2005 Newmar Dutch Star 4024
Pulling my 2012 Malibu w/Blue OX & Patriot brake unit
HicksRA is offline   Reply With Quote
Old 03-15-2014, 11:05 PM   #5
Senior Member
 
gemini5362's Avatar
 
Tiffin Owners Club
Freightliner Owners Club
Join Date: Apr 2012
Posts: 2,074
Quote:
Originally Posted by JLAppel View Post
I have a 2011 Winnebago Tour 42QD on as Freightliner XL Chassis. Since new, I have experienced a periodic overheating problem usually associated with freeway driving and then pulling off into city traffic wherein the coach overheats to the point of engine shutdown. A couple of minutes cool down, restart and high idle usually puts me back on the road within 5 minutes but thereafter, depending on traffic, the same issue persists. An early venture to Cummins resulted in an opinion that there was a "bubble" in the original coolant level. Later, a Freightliner dealer charged me $1500 to remove non-existant material between the fan and radiator plus, at my insistence, replacement of the thermostat. Problem still exists. I can drive 400 miles steady on a freeway, pull off into the city, and the coach overheats shortly thereafter. Any one experiencing similar Cummins circumstances with this motor?
that is a 3 year old maybe 4 year old coach. How long is your cummins warranty. You might want to look at the warranty information that came with your coach
__________________
gemini5362 is offline   Reply With Quote
Old 03-16-2014, 01:47 PM   #6
Junior Member
 
Freightliner Owners Club
Join Date: Dec 2011
Location: Nipomo, CA
Posts: 13
Cummins Engine Overheat

The radiator and fan are rear mounted. Freightliner completely removed the radiator from the coach to ascertain if there was something that had sucked up between the radiator and fan (a possibility according to Freightliner. Not, however, in this instance). They flushed, power washed, refilled with fresh antifreeze, reassembled, dyno'd and assured me the fan clutch and thermostat was operating normally.
I also suspect the fan clutch. The perplexing part is that it is a periodic occurrence. And of course it happens at the worst time. When the warning bell goes off, there is only about 20 seconds to get off the road. The computer just shuts the engine down - usually right in the middle of the road. Then, after a very few minutes, restart the motor and bring the rpm up. Cools down quickly, warning light goes out and I can continue on my way - sometimes long distances before it occurs again and sometimes very short distances. If I get on the highway right away following an incident, it usually runs normal. When I get stuck in traffic is when the problem persists, especially following a long highway stint.
__________________
JLAppel is offline   Reply With Quote
Old 03-16-2014, 02:12 PM   #7
Moderator Emeritus
 
smlranger's Avatar


 
Country Coach Owners Club
Freightliner Owners Club
Join Date: Sep 2004
Location: Glen Allen, VA
Posts: 6,459
Blog Entries: 1
Removing the radiator to see if there was something between the fan and radiator would be totally unnecessary. You can view the fan and the cooling pack by looking into the fan shroud, either from under the coach or overhead access from inside the coach. I believe you must have meant they thought there might have been something sucked into the space between the charge air cooler and the radiator. To clear that, radiator removal may have been necessary.

Has this been an issue since you got the coach?
__________________
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.
smlranger is offline   Reply With Quote
Old 03-16-2014, 03:08 PM   #8
Senior Member
 
bertman's Avatar
 
Winnebago Owners Club
Join Date: Mar 2012
Location: Harrisburg, PA
Posts: 160
When you say it cools rapidly after a restart, would make me think its a water pump problem. Did they replace the pump? Don't know how you would check it - you need a good Cummins shop!
__________________
Bob & Deb K.
2012 Itasca Ellipse QD 'Elli'
2010 Buick Enclave AWD Toad 'Ginny'
bertman is offline   Reply With Quote
Old 03-16-2014, 03:27 PM   #9
Senior Member
 
Bumps's Avatar
 
Winnebago Owners Club
Join Date: Sep 2013
Location: FTer Class of 2015 Origin: Evergreen, Colorado
Posts: 1,530
We had the "bubble in the coolant" problem a while back. ISL would overheat while under more stressful circumstances. Problem started after a radiator flush. Easy to diagnose, tho -- you could stand near the radiator and hear a pretty loud gurgling. Had it flushed again and problem solved. Do you hear gurgling at the radiator? Could be an easy fix (we hope). \ken
__________________
Ken & Deb (WIT Club, FMCA, SKP, Harvest Hosts, and grateful volunteers with SOWERs)
2005 Winnebago Vectra 40FD w/400ISL and Allison 3000MH on Freightliner's Evolution chassis, Onan QD7500, 1000w Renogy solar, BlueOx tow gear, and 2015 Cherokee TrailHawk toad.
[SIGPIC][/SIGPIC]
Bumps is offline   Reply With Quote
Old 03-16-2014, 03:40 PM   #10
Senior Member
 
Fleetwood Owners Club
Join Date: Dec 2004
Posts: 527
Fact, system is not getting coolant flow or air flow during slow engine speeds. There are air flow tests to determine the air flow at any engine speed.

There are pressure tests to determine water flow. Get both of these done before anything more is done which you have to pay for. It appears you already have become suckered for the $1500 although if you insisted on the thermostat you might have contributed to that issue.

Then come back here and tell us the results in order to get solutions. Or, get with an honest and skilled service center which should be doing the whole job the whole job to begin with. A person must be an active party to their service work or get screwed.
__________________
targaboat is offline   Reply With Quote
Old 03-16-2014, 03:46 PM   #11
Senior Member
 
Smitty77's Avatar
 
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 2,473
Sorry to hear of your problems, and not fun to have a coach shut down on you in a traffic condition (or anytime for that matter).

I hope a moderator will move this to the Cummins section, as some more Cummins people may be able to help.

I wonder if you have a faulty temp sensor, that occasionally sends a bad signal indicating High Temp? The computer will do what it is supposed to do, and protect the engine. The 'it happens sometimes' is the variable that makes me thing it is something electronic.

That being said, is this mostly in stop and go traffic situations? Dropping a gear to keep RPM's higher may help on this. Coupled to added heat build up, if the Allison is hunting back and forth between gears too - this will heat up the trans, which coupled to the engine could add heat too. Dropping gears, would help in both cases.

You might get a infrared heat temperature gun, not that expensive. And keep a log of actual heat read when shooting the same hose (Hose from block to radiator). If you see the same temp range after what you consider normal stop and go driving. And then get the same reading when the computer shuts you down, this could give you a better clue. (Bad temp sensor if heat ranges are the same. Or bad thermostat or water pump if heat ranges are truly that much higher.)

Either way, I would go to a Cummins shop on this. Not saying anything bad about Freightliner, but Cummins engine go to a Cummins shop. Especially if still under warranty.

Best of luck to you, and please update what you find out!
Smitty
__________________
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
Smitty77 is offline   Reply With Quote
Old 03-16-2014, 04:44 PM   #12
Senior Member
 
Fleetwood Owners Club
Join Date: Dec 2004
Posts: 527
Good suggestion on the temp sender and the infrared meter. Better than my suggestions at this point.
__________________
targaboat is offline   Reply With Quote
Old 10-12-2016, 03:56 PM   #13
Junior Member
 
Join Date: Aug 2016
Posts: 2
Did you ever get this problem fixed?
__________________
pmpurcell is offline   Reply With Quote
Old 10-16-2016, 12:32 PM   #14
Junior Member
 
Freightliner Owners Club
Join Date: Dec 2011
Location: Nipomo, CA
Posts: 13
ISL Low Coolant Sensor

I am extremely happy to report that in he 2 1/2 years since the original posting, the issue has been very simply (and inexpensively) resolved. I followed the suggestions of several contributors and purchased a gallon of approved antifreeze. Added coolant to the top of radiator (right up to the bottom of the cap. Problem has not reoccurred since. As I understand the situation, the low coolant sensor is located in such a position that when the front of the coach elevates (like going up a steep grade) the coolant level drops below the sensor level triggering the alarm and subsequent shutdown. Filling the radiator past the maximum level fill line allows the coolant to maintain a level above the sensor. Before going to any great mechanical expense, I suggest this remedy - it has worked for me. As stated earlier, I have not had a single repeat occurrence in over 2 1/2 years.
__________________

__________________
JLAppel is offline   Reply With Quote
Reply

Tags
cummins, heating


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Okay ... I SOLVED THE AUTO PARK BRAKE PROBLEM! JerryPeck Workhorse and Chevrolet Chassis Motorhome Forum 123 10-30-2016 09:14 AM
Norcold frosting problem Navy Flier RV Systems & Appliances 3 02-22-2014 09:10 AM
ISL 400 Serpentine Belt Koop Alpine Coach Owner's Forum 6 02-10-2014 01:53 PM
Cummins 8.3 won't start. '95 Winnebago Luxor Bwainsp Cummins Engines 11 10-28-2013 11:15 AM
Cummins ISL recall fix? Garbageman Monaco Owner's Forum 16 10-22-2013 02:16 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:54 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.