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Old 02-08-2016, 06:54 PM   #1
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Rv antifreeze freezing

Not sure if this is the right section but I got a quick question. I drain all the water I could out of the fresh water tank and blew out the water lines. My question is will rv antifreeze freeze up. I put some in the toilet and when it was really cold last month I noticed it was starting to freeze up. Now I'm worried that the water lines will be ruined. Has anybody ever seen this?
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Old 02-08-2016, 07:02 PM   #2
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You can actually make ice cubes from rv antifeeze, but they are more like "slush cubes". While the antifreeze will gel up, it doesn't expand to the point of causing damage unless it's outside of what it's rated for. (ie: -20, -50, -100)
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Old 02-08-2016, 07:06 PM   #3
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No worries. RV antifreeze is propylene glycol, and will not freeze solid. It will freeze, but only to the consistency of a slushy. You are fine.
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Old 02-08-2016, 07:06 PM   #4
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Generally RV Antifreeze is good to about -20 to -50 at full strength depending on the brand, but the more water that is mixed with it the higher the freeze temperature will be.

If you poured it in full strength and did not add any water you should be fine (it must have been REALLY, REALLY cold to start to freeze).

I live in North Carolina so I don't have to worry about really cold temps for extended periods (teens usually for a few days is about as bad as it gets) so I don't use RV antifreeze at all anymore. For me it is too much hassle.

For years I have only used an air compressor to purge the system after opening the low point drains and emptying and bypassing the hot water tank and have not had any issues.

If you purged the fresh water tank with the water pump after draining the tank completely, for me here that would be fine because any water left in the tank or line would have plenty of expansion space after freezing and would not hurt anything.
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Old 02-08-2016, 07:08 PM   #5
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Quote:
Originally Posted by Hasley704 View Post
Not sure if this is the right section but I got a quick question. I drain all the water I could out of the fresh water tank and blew out the water lines. My question is will rv antifreeze freeze up. I put some in the toilet and when it was really cold last month I noticed it was starting to freeze up. Now I'm worried that the water lines will be ruined. Has anybody ever seen this?
If done right you will have no problem.
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Old 02-08-2016, 07:10 PM   #6
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I just found out this year that rv antifreeze comes in two grades. If you live up north you should be buying the more expensive grade that has a lower freeze point. I lost my water filter container last year to frozen antifreeze. With temps below freezing in OH I opted for the better stuff this year. That being said we are having a milder winter this year. I will always spend the extra dollars in the future.
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Old 02-08-2016, 07:24 PM   #7
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Quote:
Originally Posted by pvillebly View Post
I just found out this year that rv antifreeze comes in two grades. If you live up north you should be buying the more expensive grade that has a lower freeze point. I lost my water filter container last year to frozen antifreeze. With temps below freezing in OH I opted for the better stuff this year. That being said we are having a milder winter this year. I will always spend the extra dollars in the future.
I usually empty my water filter housing and open the low point drains. Not enough in there to freeze that that point, but enough to make sure there isn't water present to do damage.
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Old 02-08-2016, 07:52 PM   #8
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Well the antifreeze was straight out of the jug that I put in the toilet. It was about 4 degrees out for a few days and it was almost solid in there.
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Old 02-08-2016, 07:56 PM   #9
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Per the specifications on the Jug. The min protection temperature on the label is the temp at which the product begins to expand. The damage done by ice is not directly the result of freezing, it is the result of the ice expanding. The antifreeze will become very slushy or solid, but will not expand.
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Old 02-08-2016, 08:02 PM   #10
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If you bought an extra jug, check it out. It will be a real thick slurpy but not buldge out the sides of the bottle like water would because it doesn't expand. It scared me when I first noticed that it gelled in the bowl a couple seasons ago, but it didn't hurt anything.
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