DEF fluid freeze point?
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Mountain Pass
Joined: Sep 2019
Posts: 246
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DEF fluid freeze point?
At what temp does DEF freeze? I have many diesels, but none that run DEF.
I watched this video this morning and "Guy" said that in his neck of the woods (Wyoming), DEF freezing up is a common problem.
Here in balmy TX, I rarely hear of this "issue".
I watched this video this morning and "Guy" said that in his neck of the woods (Wyoming), DEF freezing up is a common problem.
Here in balmy TX, I rarely hear of this "issue".
8th Gear
Joined: Aug 2016
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Lead Driver
Joined: Dec 2020
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I have not watched the video yet, and don't live in a cold area, but there are a lot on here who do. Some that run these trucks in a much colder environment than the freezing temp of DEF (which is around 12 deg. I think). The only time I've heard of temperature related DEF issues is when there is a problem with the DEF heater.
Lead Driver
Joined: Nov 2005
Posts: 8,466
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At what temp does DEF freeze? I have many diesels, but none that run DEF.
I watched this video this morning and "Guy" said that in his neck of the woods (Wyoming), DEF freezing up is a common problem.
Guy in WY video
Here in balmy TX, I rarely hear of this "issue".
I watched this video this morning and "Guy" said that in his neck of the woods (Wyoming), DEF freezing up is a common problem.
Guy in WY video
Here in balmy TX, I rarely hear of this "issue".
Lead Driver
Joined: Dec 2020
Posts: 8,640
Likes: 2,433
As far as I know it does not heat from the block heater. The DEF heater heats when the truck is running. Ford states not to overfill the DEF tank for this very reason, because it freezes. As long as the DEF heater and heated line is functioning properly, the fact that DEF freezes does not appear to be an issue. At least not from what I've read from Ford.
Lead Driver
Joined: Nov 2005
Posts: 8,466
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DEF tank heater is part of the pump assembly, operates when the truck is running and it is called for due to temperature.
Truck is set to operate normally until the heater provides enough liquid DEF to be pumped.
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Lead Driver
Joined: Oct 2018
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I've been in -20 to -30 numerous times and never had a problem. I did see a friend's new 2020 F350 freeze up once and I believe it was caused by ice building up under the tank and -25 temps. the dealer left it in the shop overnight and it's been fine ever since.
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