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Old 01-07-2018, 10:32 AM   #1
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RV Antifreeze

I do a walk thru in my little Jayco quiet often being it is parked beside the shop and I can't camp now. A couple days ago I noticed the toilet seal had let the antifreeze leak through so I got some plumbers silicone grease and lubed it good. I put some Super Tech RV antifreeze in and left. Today I go check it and it was 32 degrees inside although about 4 outside. Very good insulation I thought so I checked the toilet and there was a skim of ice in there, not solid but very icy. The rest of the bottle stored under the sink was mushy and a full unopened bottle was almost solid ice. I am not worried about freezing because I blow all the lines out with air before I put the antifreeze in. The bottle says protection for -50 below. Just my observations.
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Old 01-07-2018, 10:38 AM   #2
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It's my understanding from reading various posts, that the RV antifreeze will freeze, but will turn into mush instead of a solid chunk of ice. The mush does not expand as much, thus no damage to the plumbing.

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Old 01-08-2018, 07:25 AM   #3
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I usually/try to leave a facet open so any pressure build up be released from the slushy AF. Slush is better than solid ice.
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Old 01-08-2018, 11:20 AM   #4
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Yes, I've heard that antifreeze actually does freeze, it just doesn't expand.
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Old 01-08-2018, 12:49 PM   #5
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It does freeze, but water is the only substance that expands when frozen.

Are you sure it leaked through? Or did it evaporate? The stuff I use evaporates, and leaves a red film. I now float a little mineral oil on top of the antifreeze, in all my drains. Now in the spring, there is antifreeze above the seal, and in each pee trap.
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