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Old 04-05-2018, 04:25 PM   #1
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1969 31' Sovereign
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DEF Freezing

Have any of you folks living in colder climates have any issues with DEF freezing? I have a 2017 Ram 3500 Heavy Duty Turbo Diesel, I live in McCall, Idaho, and have had no issues. I assume it's possible, just curious if anyone have experienced it.

Thanks
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Old 04-05-2018, 07:34 PM   #2
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I have not had any DEF freezing problems in my '13 Super Duty. The DEF tank is heated. There are required sensors to tell you if the DEF freezes and is not dosing the SCR correctly. Mine might go to limp mode.

There is just a lot of diesel trucks out there with DEF tanks.

DEF does freeze as it is what, 70% water.

David
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Old 04-06-2018, 08:14 AM   #3
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DEF Freezing

I know the tank is heated, but how about when the vehicle is not in use?
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Old 04-06-2018, 09:31 AM   #4
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Quote:
Originally Posted by supercubep View Post
I know the tank is heated, but how about when the vehicle is not in use?
It begins freezing at 17* and becomes a slush at down around 13*F. The system has a time out for DEF injection and corresponding code setting until after the heater is activated for a few minutes after cold startup. Since there is a very little bit of DEF injection at any given time, it only needs to thaw a small amount right around the pick-up tube. As operation continues, the whole jug eventually becomes liquid.

In EXTREME arctic conditions it is sometimes necessary to install additional insulated and heated covers over the jug....but we're talking extreme conditions (ie. Prudoe Bay fleets)
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Old 04-06-2018, 09:44 AM   #5
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Basically, you are fine as long as you don't top off the DEF tank when freezing temperatures are expected. This allows room for expansion as the DEF freezes.
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Old 04-07-2018, 08:18 AM   #6
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DEF Freezing

Thanks for the valuable input!
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