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Old 12-15-2017, 12:56 PM   #1
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Anti-freeze Frozen

I stopped my to check on my motorhome yesterday and noticed that the RV anti-freeze in the toilet bowls was frozen. Low temperatures have been in the low teens recently here in the Detroit area. I am wondering why this would happen and how much trouble I am going to find when I dewinterize.
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Old 12-15-2017, 12:58 PM   #2
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I stopped my to check on my motorhome yesterday and noticed that the RV anti-freeze in the toilet bowls was frozen. Low temperatures have been in the low teens recently here in the Detroit area. I am wondering why this would happen and how much trouble I am going to find when I dewinterize.
Is it truly frozen hard or thick like slush? Thick like slush is normal.
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Old 12-15-2017, 01:01 PM   #3
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Is it truly frozen hard or thick like slush? Thick like slush is normal.
Correct.
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Old 12-15-2017, 01:02 PM   #4
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First... is it pure R/V antifreeze or is it possibly diluted with water from not first blowing out the lines?

Second... while R/V antifreeze will get slushy and possibly even freeze at below zero temperatures, (most are good for -25F to -50F, some even more), but UNLIKE water, it will not expand when frozen.

If your is diluted, all bets are off.
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Old 12-15-2017, 01:12 PM   #5
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It is frozen, not just slush. Although, I did not blow the lines out first I used quite a bit of antifreeze to run through the lines.
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Old 12-15-2017, 01:14 PM   #6
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So if the anti-freeze doesn't expand, does that mean it should not damage the lines?
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Old 12-15-2017, 01:16 PM   #7
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What brand?
R/V antifreeze for sure?
Do you have any left?

If it is freezing SOLID at temperatures 'in the teens', something is wrong with it or it is diluted.
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Old 12-15-2017, 01:21 PM   #8
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So if the anti-freeze doesn't expand, does that mean it should not damage the lines?
R/V antifreeze does not expand when frozen.

Water is the only common liquid that expands when frozen.
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Old 12-15-2017, 01:26 PM   #9
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I believe it was Winter Tech RV Anti-freeze. I don't have any left. Are you supposed to blow out the lines and then run anti-freeze through them. From every thing I read, it was one or the other.
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Old 12-15-2017, 01:56 PM   #10
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I believe it was Winter Tech RV Anti-freeze. I don't have any left. Are you supposed to blow out the lines and then run anti-freeze through them. From every thing I read, it was one or the other.
At least open up the low point drains, open all faucets including outside shower, pull the anode on the WH and step on the toilet pedal until its done running out. Isolate( turn the valves) the WH from the rest, even if you don't blow out with air. The RV antifreeze is close to 50% water to start out with. A few ounces of water left in the corners of the system won't matter mixed in 2+ gal. of AF
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