DEF, Newbie question - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 02-09-2011, 04:10 PM Thread Starter
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DEF, Newbie question

Ok, I have read the urea stuff will freeze at about 10 degrees....

What happens when the stuff does freeze? I understand that ford has a heater or something in the tank (only works when motor is on right?), but isn't the tank prone to bursting because of the stuff freezing I ask because the temp was -12 when I got up to go to work this morning. The other week made it to -24!
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post #2 of 5 Old 02-10-2011, 07:38 AM
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post #3 of 5 Old 02-10-2011, 12:00 PM
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Yes, the DEF is heated. Your truck will not attempt to use any until it is thawed and ready. The DEF is stored in a bladder, rather than a solid tank, to prevent freeze damage.

Also, I believe this bladder is located above or just along side the fuel tank in a boxed thingy that is somewhat flexible. I tried to trace the fill line once and that is where I thought it went but did not want to lay down and get dirty that day.

Don't worry about the DEF in cold weather, it takes care of itself.


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post #4 of 5 Old 02-10-2011, 08:21 PM Thread Starter
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Thanks for the info, I was fairly certain the def was nothing to worry about since there are a ton of these trucks running around this area. Just trying to get all my info straight before deciding to pony up the cash for a new truck!
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post #5 of 5 Old 02-11-2011, 08:01 AM
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I've been out in -11 and the wind chill was -25 with no problem.
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