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Old 01-01-2014, 05:53 AM
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DEF question

I read in the manual that the def fluid freezes around 12 F. was wondering if there is something I need to do to prevent this when using the truck in those temps. thanks in advance.
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Old 01-01-2014, 06:13 AM
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From what I understand, the DEF tank has a small heater in it. The truck doesn't start using DEF until a few miles have passed which would allow time for it to defrost from the heater.

Also when you shut the engine off, you can hear a pump running for about 30 seconds. This is a purge pump that purges DEF from the lines so it doesn't freeze up in the lines.
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Old 01-01-2014, 06:18 AM
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thanks, wow there sure is a lot more things on these new trucks that can go wrong compared to my '97 7.3.
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Old 01-01-2014, 07:56 PM
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Quote:
Originally Posted by daystrom View Post
From what I understand, the DEF tank has a small heater in it. The truck doesn't start using DEF until a few miles have passed which would allow time for it to defrost from the heater.

Also when you shut the engine off, you can hear a pump running for about 30 seconds. This is a purge pump that purges DEF from the lines so it doesn't freeze up in the lines.

Thanks for they, I love learning about this truck, and I wondered how they did that, although I've never heard the pump run post shutdown.

Does it sense the OAT and only pump it back to the tank if it is below 12 degrees? That wouldn't work when the temp drops a bunch during the night.
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