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Old 05-23-2020, 05:26 AM   #1
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Conversion to Fleetguard ES Compleat OAT - Who has a actually had a sensor issue

The coach (2015 Tiffin Phaeton) we are considering for purchase was brought to a local Cummins Service Center for a coolant flush and change. I spoke with the service manager at Cummins and found out they used ES Compleat OAT rather than the original conventional coolant with SCA. He told me he has never heard of the low coolant sensor issue and they have done this coolant conversion on a lot of coaches.

I called Freightliner and was told that I will have issues with the low coolant sensor and get stuck on the side of the road. I asked if there was an OAT compatible sensor and was given the part number KYS 5022 02185 06. However, I am having a hard time finding this part. My plan was to throw the part in my toolbox for a roadside repair just in case, if thatís even feasible.

I have searched and read a lot about this subject on several RV forums and the Freightliner concern seemed to be echoed by lots of folks who have spoke to them. What I havenít seen is guys reporting low coolant sensor failures.

Has anyone actually had a low coolant sensor failure as a result of swapping your coolant over to ES Compleat OAT? How frequently does this occur?
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Old 05-23-2020, 05:50 AM   #2
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I bought a used '16 Tiffin and just made the same decision to use original coolant in the flush/refill because of the potential failure of the sensor and engine shutdown. There has been several mentions of this on the Tiffin forums.
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Old 05-23-2020, 07:17 AM   #3
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Changed my coolant to OAT at 45,000 miles, 65,000 now. No problems with sensor.
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Old 05-23-2020, 07:49 AM   #4
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I did last year. Replaced the sensor and no more problems and I still have the OAT coolant.
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Old 05-23-2020, 08:43 AM   #5
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Quote:
Originally Posted by Mr_D View Post
I did last year. Replaced the sensor and no more problems and I still have the OAT coolant.

Did you use the sensor part number I listed above? Also, was the sensor issue you had directly related to the use of OAT?
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