Need a Smart Guy help with the DEF - Ford Powerstroke Diesel Forum
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Old 03-20-2010, 04:04 PM
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Need a Smart Guy help with the DEF

Ok I understand that the DEF freezes around 12 degrees and that the truck has line and tank heaters that work with the key on. Here is my Question, I live in Alaska and the outside temperature is below 12 degrees for 3 months straight during a warm winter, so will the truck start and run long enough for the DEF to thaw?
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Old 03-20-2010, 04:08 PM
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just wait till the tunes and deletes come out and get rid of that crap
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Old 03-20-2010, 04:25 PM
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I'm 90% sure that the truck has to run for someting like 30 min, or X amount of miles before it starts using DEF, so it will have plenty of time to thaw.
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Old 03-20-2010, 04:45 PM
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def

There is a winter DEF go to -20F
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Old 03-20-2010, 07:34 PM
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DEF is for reducing NOx emission, and NOx formation is very, very temperature dependent. A little hotter makes a LOT more NOx. So I guess it's reasonable that the truck might not need to use any DEF unless and until it's warmed up.

I wonder what they do to keep the freeze/thaw cycles from destroying the tank though.
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Old 03-21-2010, 05:28 AM
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def

If it does freeze thaw. i wonder if they used a bladder like system.
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Old 03-21-2010, 07:54 AM
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I'm not worried about the DEF, Ford has tested it in cold weather. Can't wait for the tuners to get a hold of this.
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Old 03-25-2010, 05:00 AM
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Don't worry about it freezing. There is a tank heater, and line heater as well. The lines are emptied when you shut the key off.
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Old 03-25-2010, 06:38 AM
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Like I stated in the first post i Understand about the line and tank heaters but they only work when the key is on, and all the testing in the cold was done to the trucks with them running 24/7, if the truck sits for 8-12 hours at night in sub zero temps it will take the tank some time to thaw. What I want to know: is there enough time from when the tank is fully frozen untill thaw to drive the truck with out an idiot light or other issues.
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