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Old 07-25-2019, 11:38 PM   #113
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What a PITA

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Originally Posted by Banning406 View Post
So glad to have found all this information about this problem. I agree whole heartedly that a class action suit should be upcoming. Our 2009 Berkshire 390BH with 340ISB CUMMINS has had the exact problem overheating on hills. We had work done at Cummins in Billings, Montana - radiator boiled out, thermostat replaced, turbo sensor replaced, EGR valve replaced, new antifreeze- $4300 later still heating up on the hills. Started researching and found this thread. Might have to try the direct drive fan.
Sorry to hear of your troubles but there are hundreds of us who have had the same experience. I had similar work done as you did and for a year it was OK.
Last year we were driving between Quartzite and Yuma after driving down from Canada no problem when up goes the temp gauge, on comes the alarm and the mild cussing begins. I pulled over and turned off, waited a few minutes and started up and all was good for 4 months and back to Canada. Go figure - I cant. I have a chum with a Cummins 350 in his Itasca and any incline causes the sympton. He has had EVERYTHING done and no resolution.
It has to be a software problem. Not as bad as B737 Max but same root cause
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Old 08-03-2019, 08:04 AM   #114
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Recent experience with ISB 6.7L 350 Fan Clutch

Hello all - just to throw in my 0.02.
We own a 'new to us' 2008 Winnebago Journey with the 6.7L ISB EPA07 350hp engine and 55k miles on ISC rear-radiator chassis.

The previous owner had Freightliner replace the fan clutch due to all of the above symptoms before we purchased the rig.
We began experiencing the same tendency to overheat (although I never actually let it overheat - just watched the gauges perform EXACTLY as described). First I verified cleanliness of radiator and CAC and so on - all was well.
Cutting to the chase...I just returned from Camp Freightliner in Gaffney where their service department took a look. They suggested installing a "Guard Dog" instead of replacing the clutch, as the clutch itself is new (within 2 years) and there are no oil leaks, signs of slippage, etc.
The Guard Dog is a sort of override fan controller and is a small box that clips in to the harness that drives the fan.
Problem solved. Zero overheating and the fan cycles up and down as appropriate (like it should have in the first place). Cost for Guard Dog was $300.00. The Guard Dog is a product made by Horton
Horton Vehicle Products | Horton
I gave the techs at FL in Gaffney the SS Code 3737 and we discussed everything from just pull the fuse and leave the fan locked all the time, to replace the fan clutch, to a direct-drive solution.
Time will tell if I made the right decision, but at $300.00 it was a risk I was willing to take starting low and going slow versus yet another fan clutch still to have issues remain.
So far 3000k miles home and zero problems the entire return trip over 2 weeks.
Just to share my experiences. I'll post again if the 'fix' doesn't hold!!
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Old 08-04-2019, 09:42 PM   #115
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Quote:
Originally Posted by ziaptrn View Post
Hello all - just to throw in my 0.02.
We own a 'new to us' 2008 Winnebago Journey with the 6.7L ISB EPA07 350hp engine and 55k miles on ISC rear-radiator chassis.

The previous owner had Freightliner replace the fan clutch due to all of the above symptoms before we purchased the rig.
We began experiencing the same tendency to overheat (although I never actually let it overheat - just watched the gauges perform EXACTLY as described). First I verified cleanliness of radiator and CAC and so on - all was well.
Cutting to the chase...I just returned from Camp Freightliner in Gaffney where their service department took a look. They suggested installing a "Guard Dog" instead of replacing the clutch, as the clutch itself is new (within 2 years) and there are no oil leaks, signs of slippage, etc.
The Guard Dog is a sort of override fan controller and is a small box that clips in to the harness that drives the fan.
Problem solved. Zero overheating and the fan cycles up and down as appropriate (like it should have in the first place). Cost for Guard Dog was $300.00. The Guard Dog is a product made by Horton
Horton Vehicle Products | Horton
I gave the techs at FL in Gaffney the SS Code 3737 and we discussed everything from just pull the fuse and leave the fan locked all the time, to replace the fan clutch, to a direct-drive solution.
Time will tell if I made the right decision, but at $300.00 it was a risk I was willing to take starting low and going slow versus yet another fan clutch still to have issues remain.
So far 3000k miles home and zero problems the entire return trip over 2 weeks.
Just to share my experiences. I'll post again if the 'fix' doesn't hold!!
Thanks for the information! I had heard about the guard dog but want sure what it was.
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Old 08-15-2019, 01:05 PM   #116
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I have a Bounder 5.9L ISB, 2001Freightliner chassis. When I contacted Source they have no info on Bounders. (really?). Anyway, they sell the fan but not the direct drive to eliminate it. How did you mount the fan to your Cummins? Where did you get the drive adapter?
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Old 08-17-2019, 05:58 AM   #117
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Quote:
Originally Posted by TDebrocke55 View Post
I have a Bounder 5.9L ISB, 2001Freightliner chassis. When I contacted Source they have no info on Bounders. (really?). Anyway, they sell the fan but not the direct drive to eliminate it. How did you mount the fan to your Cummins? Where did you get the drive adapter?
If a direct drive fan is what you are wanting, locate the 5A fan clutch fuse and remove it. You will then have a direct drive fan. This is info obtained from a Freightliner rep at the Winnebago Grand National Rally. Thanks to ziaptrn I now know the location of the fuse on my motorhome. Next time I have an overheating issue the fuse will be gone. If Bounder is anything like Winnebago, it may not be in the most accessible location.
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Old 08-19-2019, 02:50 PM   #118
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I pulled my fan clutch fuse yesterday and took a 40 minute drive, heat gauge held right where it was supposed to.
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