Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 01-08-2015, 10:16 PM   #1
Senior Member
Join Date: Mar 2005
Location: Northern Oklahoma
Posts: 3,146
Damage to DEF tank due to freezing

I've been reading the DEF will freeze around 11-12 degrees and the tank will be fine if not completely full. I've always heard that ice expands equally in all directions so I was wondering if a DEF tank can be damaged while setting in freezing temperatures even if only 1/2 full? I understand the tank has a heater prob that works when the engine heater is on but this is usually not the case all winter. This situation could occur while winterized for several weeks and not driven. Will the tank still survive?

wagonmaster2 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-09-2015, 05:22 AM   #2
Community Moderator
"007"'s Avatar

Nor'easters Club
Workhorse Chassis Owner
iRV2 No Limits Club
Join Date: Oct 2004
Posts: 24,434
Here are some links that may help you out.

98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
"007" is offline   Reply With Quote
Old 01-09-2015, 07:23 AM   #3
Senior Member
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 21,174
Something to think about.....

There are thousands of different elements and solutions and compounds here on the planet Earth..

Question:How many of them expand when they freeze?

Answer: ONE,, yes, just ONE,, Water

PINK stuff, for example (RV antifreeze) Freezes very easily,, it just does not expand, thus it does not blow tanks up.

Truck drivers have to have DEF tanks, and often find themselves far colder than -11 out.. I mean I personally have walked around in -40 (but that was before DEF), I would not worry about it.
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 01-09-2015, 04:22 PM   #4
Senior Member
Winnebago Owners Club
Join Date: Jul 2003
Posts: 673
From all that I've read, DEF expands by only about 7% when frozen and manufacturers have taken this expansion rate into account when designing the tanks that hold the fluid. I suppose from a theoretical standpoint, if you store the coach with the DEF tank filled right up to the cap, that it may have the potential to crack the tank but how many will have their DEF filled past the fill line before storing the coach for the winter? Personally, I believe it's a non-issue.
theroc is offline   Reply With Quote
Old 01-09-2015, 04:39 PM   #5
Senior Member
D Lindy's Avatar
Winnebago Owners Club
Join Date: Aug 2013
Posts: 1,258
Had our DEF tank 1/2 full last winter and with the Polar Vortex -0 temps for days on end and no issues.
2012 Journey 40U (Our Incredible Journey)
2008 Dodge Dakota
2004 Subaru Baja
D Lindy is offline   Reply With Quote
Old 01-09-2015, 06:55 PM   #6
Senior Member
Ray,IN's Avatar
Join Date: Aug 2001
Location: North America somewhere
Posts: 12,303
If freezing was a problem, trucking companies would be making it known.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"
Ray,IN is offline   Reply With Quote
Old 01-09-2015, 07:03 PM   #7
Senior Member
taylorgso's Avatar
Thor Owners Club
Join Date: Feb 2013
Location: Greensboro, NC
Posts: 244
I've read on Peak (major maker of dEF) that DEF does not freeze hard, but merely turns to a slush. I doubt this would result in cracking the DEF tank.

Ed [N4RWU] Taylor (Becky), Mistie (4 legger)
2014 Thor Tuscany XTE 40GQ
Former Thor Palazzo 33.2
taylorgso is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Winterize Def Tank? foxyhigg Entegra Owner's Forum 4 11-13-2014 09:13 AM
Black tank issue--2014 DSDP sd1209 Newmar Owner's Forum 6 07-28-2014 12:29 AM
DEF Tank Mediq Newmar Owner's Forum 6 06-22-2014 07:21 PM
How to test holding tank sensors Jbmsr Class A Motorhome Discussions 8 05-06-2014 01:16 PM
How to test holding tank sensors Jbmsr Winnebago Industries Owner's Forum 15 02-05-2014 10:09 AM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:45 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.