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Author Topic: Over heating problems  (Read 1241 times)

banjo5491

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Over heating problems
« on: August 08, 2019, 12:13:49 PM »
I have a 07 Tour on a Freight liner chassis with a 400 hp Cummings engine. There our times when on the road the engine temp will run 210-212 degrees and some times cool down to the 190ís. I have been told the problem is the fan clutch,my local dealer said it doesínt have a fan clutch. Can anyone tell me ,what is what,         
With the fan clutch and other possible solutions I should consider.
DC

ChasA

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Re: Over heating problems
« Reply #1 on: August 08, 2019, 04:33:24 PM »
I don't know if your engine has a fan clutch but my 6.7 does. One thing I know for sure though is you don't have a Cummings engine. What dealer are you talking about? An RV dealer?
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banjo5491

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Re: Over heating problems
« Reply #2 on: August 12, 2019, 11:19:54 AM »
My 07 tour has a Cummings engine!!  Check your facts!!
DC

Top38

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Re: Over heating problems
« Reply #3 on: August 12, 2019, 11:32:57 AM »
If it runs warmer under heavy loads such as long hills then I'd say you need to have the radiator/intercooler cleaned as they get clogged up over the years with engine grime. If it has nothing to do with engine load then it could be a number of things like a clutch fan or sticking thermostat.

John Hilley

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Re: Over heating problems
« Reply #4 on: August 12, 2019, 01:23:55 PM »
My 07 tour has a Cummings engine!!  Check your facts!!

You don't have a Cummings engine, you have a Cummins engine
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jackiemac

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Re: Over heating problems
« Reply #5 on: August 12, 2019, 02:28:32 PM »
This isn't a spelling bee, let's keep it friendly please.
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John Canfield

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Re: Over heating problems
« Reply #6 on: August 12, 2019, 06:48:20 PM »
Your Cummins ISL should run about 210 degrees on the road and not 190. Sure sounds like a bad fan clutch.
--John
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ste1148watt

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Re: Over heating problems
« Reply #7 on: August 13, 2019, 07:46:29 PM »
As they say ďbeen there, done that.  I have the exact problem on an 05 ISL 400. Even with a new radiator , thermostat and cleaning still have the overheating on long hills. Only answer I have found is to keep the rpm around 2000 and/or slow down. Iím convinced the radiator is too small for the unit although Freightliner will never admit to it. I doubt you have a fan clutch, most fans are run by hydraulic pumps on this model. Hope this helps . I think John has the same issue on his .

John Canfield

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Re: Over heating problems
« Reply #8 on: August 14, 2019, 04:12:27 PM »
His 2007 Tour has a rear radiator,  not a side radiator. His fan is driven right off the engine.
--John
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ste1148watt

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Re: Over heating problems
« Reply #9 on: August 14, 2019, 07:53:47 PM »
Thatís another animal for sure. Forget everything I said 😊

cerd

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Re: Over heating problems
« Reply #10 on: August 15, 2019, 06:39:03 AM »
I don't know anything about Diesels, but on all of my gassers, 210 is normal. The thermostats are rated for 190, but that doesn't mean that it will keep it at 190. Conditions such as high heat and low airflow from stop and go road conditions, for example, will make it go a little higher.

If you are worried about it, change the fan clutch. I think you will be fine though. When your fan goes, it will be a significant difference...like 230+, causing you to pull over and let it cool down.
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John Canfield

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Re: Over heating problems
« Reply #11 on: August 15, 2019, 07:13:25 AM »
My engine exhibited similar cooling characteristics when the Freightliner dealer forgot to plug in my fan controller after an engine head job. Coolant temps went down along with MPG. Since he has a rear radiator, he has a mechanical fan clutch that might be locking up cooling the engine down too much.
--John
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Utclmjmpr

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Re: Over heating problems
« Reply #12 on: August 15, 2019, 10:25:38 AM »
 If your right John,, then he has also had a dive in the mileage and hasn't noticed it.. It isn't difficult to open the hatches and take a look at things to determine if he is getting the truth.>>>Dan   ( Banjo,, Look up the life of Clessie Cummins,, a very accomplished person in American history)
« Last Edit: August 15, 2019, 08:26:11 PM by Utclmjmpr »
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Five2o

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Re: Over heating problems
« Reply #13 on: August 21, 2019, 05:03:36 PM »
I have the 400 ISL in my Ellipse...temperature often goes up as high as 212-216 at which point the fan kicks in, before falling back to 195 or so in hot weather & steep climbs since I bought the rig 10 years ago. I'm usually too lazy to gear down etc so just leave the rig on cruise control & let the Allison decide how it wants to climb.. Freightliner tech says its all normal...I've got 136000 miles on her so I guess everything is OK.
« Last Edit: August 21, 2019, 05:05:54 PM by Five2o »

John Canfield

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Re: Over heating problems
« Reply #14 on: August 22, 2019, 07:24:18 AM »
^^ sounds normal to me  :)) :)) ^
--John
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ste1148watt

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Re: Over heating problems
« Reply #15 on: September 24, 2019, 09:44:08 AM »
I have always had trouble with my ISl 400 (side radiator) tending to overheat.  Manually keeping rpms around 2000 helps but what a pain.  Our recent trip from Vancouver to Dallas , I removed the rear rock guard,  not the ones behind the tires, and the temps came down to a consistant 200-205 without manually shifting to a lower gear.  Seems like the rock guard was creating an air dam and not letting the air  pass though as intended.
 

John Canfield

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Re: Over heating problems
« Reply #16 on: September 24, 2019, 11:18:06 AM »
I have always had trouble with my ISl 400 (side radiator) tending to overheat.  Manually keeping rpms around 2000 helps but what a pain.  Our recent trip from Vancouver to Dallas , I removed the rear rock guard,  not the ones behind the tires, and the temps came down to a consistant 200-205 without manually shifting to a lower gear.  Seems like the rock guard was creating an air dam and not letting the air  pass though as intended.
 
Ah-ha!
Your logic makes a lot of sense, mine is coming off. It's all beat up anyway.
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cerd

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Re: Over heating problems
« Reply #17 on: September 26, 2019, 09:58:54 AM »
Ah-ha!
Your logic makes a lot of sense, mine is coming off. It's all beat up anyway.

I would be concerned about debris hitting the radiator. Is there something else to keep it from getting damaged? If not, you way want to consider some kind of screen for it...expanded steel grate perhaps.
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John Canfield

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Re: Over heating problems
« Reply #18 on: September 26, 2019, 03:39:28 PM »
That's a possibility I suppose,  the disadvantages of that flap far outweigh any advantages. When we used a tow shield on front of our old Jeep Liberty toad, the flap would kick up rocks, the rocks would hit the toad shield and ricochet into the back cap. When we got back from Alaska I noticed maybe 50 gel coat dings where the paint was chipped off.
--John
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k9cop

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Re: Over heating problems
« Reply #19 on: September 27, 2019, 09:08:26 AM »
I have always had trouble with my ISl 400 (side radiator) tending to overheat.  Manually keeping rpms around 2000 helps but what a pain.  Our recent trip from Vancouver to Dallas , I removed the rear rock guard,  not the ones behind the tires, and the temps came down to a consistant 200-205 without manually shifting to a lower gear.  Seems like the rock guard was creating an air dam and not letting the air  pass though as intended.
 

When I get my RV back, I am going to look for the rock guard that you are talking about. The only rock guard I knew about was the ones behind the wheels.

John Canfield

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Re: Over heating problems
« Reply #20 on: September 27, 2019, 11:59:41 AM »
There are mud flaps immediately behind the rear wheels and maybe three or four feet back is almost a full width flap hanging from two points. This thing must weigh 40 pounds.
--John
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