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Old 09-25-2015, 03:35 PM   #29
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Just to add to the thread. My fan clutch went for the second time this past summer. 30000 miles on ISB engine. This time a portion of the bracket went through the radiator. Whole thing cost me $6000. There must be a better way.
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Old 09-26-2015, 07:40 PM   #30
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Quote:
Originally Posted by Silver007 View Post
Just to add to the thread. My fan clutch went for the second time this past summer. 30000 miles on ISB engine. This time a portion of the bracket went through the radiator. Whole thing cost me $6000. There must be a better way.
Silver,

Which ISB do you have? What year is your RV?
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Old 09-26-2015, 11:10 PM   #31
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Fan Clutch

Sorry to hear of your trouble Silver. Im driving a 2011 Tiffin Allegro RED. 340 Cummings with 2500 Allison Trans. Love it bumper to bumper but the fan clutch issue is disheartening. Too many of us I think.
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Old 09-27-2015, 12:17 AM   #32
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I want to chime in here regarding the electro-viscous fan clutch operation. It is not either engaged or disengaged, in a nutshell, the ecm can vary the amount of fan speed electronically depending on engine cooling requirements. About a dozen parameters are taken into consideration by the ecm to determine the optimal fan speed.

In a pick-up truck, the fan clutch has a big impact on power/fuel economy but in a diesel application it is actually more of an issue to keep the temp stabilized in a narrow band.

My '13 ISB 360 will fluctuate from 185 to about 210 and back depending on the hill we're climbing or the descent we're going down. It has 16,000 miles on the odometer. It may be time to get out the ext. warranty contract and visit the Cummins dealer to have mine replaced.

Anyone know how they access the fan clutch on the rear radiator coaches? From underneath maybe? Seems like a lot of work to r+r the radiator for fan access.
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Old 09-27-2015, 08:38 AM   #33
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Since I've subscribed to this thread I'm surprised by the number and the consistency of the failure mode of this fan clutch. I spent $1,800.00 fixing mine at the local Freightliner dealer, with no help from my warranty company. I've decided to file a complaint with the DOT. This is the website: https://www-odi.nhtsa.dot.gov/ivoq/
While the safety aspect of the part may be debatable, the assembly is clearly defective and the OEM should recall this part and pay for repairs that have been made. The DOT may not be the right government agency, I welcome any thoughts about this.
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Old 09-28-2015, 07:50 AM   #34
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Quote:
Originally Posted by Agaveguy View Post
I want to chime in here regarding the electro-viscous fan clutch operation. It is not either engaged or disengaged, in a nutshell, the ecm can vary the amount of fan speed electronically depending on engine cooling requirements. About a dozen parameters are taken into consideration by the ecm to determine the optimal fan speed.

In a pick-up truck, the fan clutch has a big impact on power/fuel economy but in a diesel application it is actually more of an issue to keep the temp stabilized in a narrow band.

My '13 ISB 360 will fluctuate from 185 to about 210 and back depending on the hill we're climbing or the descent we're going down. It has 16,000 miles on the odometer. It may be time to get out the ext. warranty contract and visit the Cummins dealer to have mine replaced.

Anyone know how they access the fan clutch on the rear radiator coaches? From underneath maybe? Seems like a lot of work to r+r the radiator for fan access.
The Freightliner dealer in Ft. Worth repaired mine by going in from underneath. They had to remove some exhaust parts to do it.
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Old 09-28-2015, 10:26 AM   #35
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Fan clutch access

The access is through a floor panel in the bedroom by the closet. I pulled it prior to bringing it in to save on labor $. Takes quite some time to find the screws.


Quote:
Originally Posted by Agaveguy View Post
I want to chime in here regarding the electro-viscous fan clutch operation. It is not either engaged or disengaged, in a nutshell, the ecm can vary the amount of fan speed electronically depending on engine cooling requirements. About a dozen parameters are taken into consideration by the ecm to determine the optimal fan speed.

In a pick-up truck, the fan clutch has a big impact on power/fuel economy but in a diesel application it is actually more of an issue to keep the temp stabilized in a narrow band.

My '13 ISB 360 will fluctuate from 185 to about 210 and back depending on the hill we're climbing or the descent we're going down. It has 16,000 miles on the odometer. It may be time to get out the ext. warranty contract and visit the Cummins dealer to have mine replaced.

Anyone know how they access the fan clutch on the rear radiator coaches? From underneath maybe? Seems like a lot of work to r+r the radiator for fan access.
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Old 09-28-2015, 11:00 AM   #36
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Good luck. Freightliner told me no chance since not safety related. I think the dealers need to get on board with some pressure to correct the issue and/or maybe a class action lawsuit. I'll be looking for your future posts. I'm going to check with Tiffen and an attorney, (my brother) and see what shakes out.
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Old 09-29-2015, 01:32 AM   #37
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I do have floor access in the rear bathroom but it does not extend far enough back to access the front of the engine where the fan is at.

There is quite a bit of room underneath when you begin poking around under there.
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Old 09-29-2015, 07:42 AM   #38
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Good feedback from Freightliner. I'd expect that answer. Defective products get recalled all the time. I'll look at Commerce. Thanks.
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Old 10-01-2015, 01:03 PM   #39
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Re: accessing/replacing the fan, on my 2010 Winnebago Journey Express they had to remove the radiator and the intercooler from outside at the rear to replace my fan after the second viscous drive multi-speed fan went belly up.
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Old 10-03-2015, 04:00 PM   #40
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FL covered the cost of mine one month out of warranty because it was on record that I had emailed them about the problem 2 months before the warranty expired. Dodged the bullet.
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Old 10-18-2015, 08:09 PM   #41
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Is the fan clutch a Freightliner or Cummins part? I ask because when I go on Access Freightliner I cannot find the part. Maybe class action needs to be taken against Cummins? I don't know but would like to.
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Old 10-18-2015, 08:11 PM   #42
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Silver,

Which ISB do you have? What year is your RV?
Sorry for the delay I have not been on line. I have a 340 HP with the 2500 transmission
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