RearViewMirror
Senior Member
Just something to keep in mind about RV antifreeze. It will not freeze solid but it will turn into a form of slush under extremely cold temps. If that happened either in your macerator or the line running to it that would prevent the line from draining properly. When you heated it up with the hair dryer it became liquid again.
Also, insulated pipes don’t necessarily keep liquids from freezing. If they are exposed to cold temps for prolonged periods then the liquid inside will eventually freeze, especially if it’s water. An electrical heat tape wrapped around the pipe will help prevent freezing.
Another way, albeit wasteful, is to keep water flowing through the pipe. This could get you through the night until you figure out a better way.
Glad you found the problem and good luck in getting a permanent resolution.
Thanks for the response. That is exactly what I found when I was using the hair dryer on that exposed part of the line from the sink. There are "weep" holes in the passenger side of the van directly below the low tank drains. I'm not sure how the water was getting to those "weep holes" but there was a small amount of antifreeze dripping from those holes and it was exactly as you said. Slush.
So I can only assume that was what was clogging up sink drain underneath the van. It had nothing to do with the original question I had about the macerator. The macerator was fine. It was the drain line that was frozen to slush. "If" they had done their job correctly and actually insulated that portion of the line I would have never had this issue. It wouldn't have frozen to a slush in the amount of time the van was exposed to those temps and wind. But they didn't do their job correctly and I had about 2' of exposed drain line (going though a 6" exposed hole in the floor of my van) before it finally went into the insulated portion of the line. That is where it froze. And I'm actually surprised that didn't freeze "some" of the plumbing directly above that 6" hole. If I hadn't put antifreeze in those lines? I'm pretty sure they would have froze there.
You are correct that any amount of insulation will "eventually" get to the outside temperature if exposed for a long enough period of time. I am convinced that if I hadn't put antifreeze in all of the lines (especially the exposed sink drain) that some of them would have burst. The diesel heater was on in the van that night since it was -35F windchill and -1F actual temperature. I noticed the next night that behind the drawers was freezing cold even with the diesel heater set to 80 degrees. It was because of that 6" hole in the floor. "I" did everything that I was supposed to do. Since we use the van all the time, I cannot completely winterize the van. So when we have weather like this, I have to do the next best thing and that is run antifreeze through all the lines and clean it out once the weather clears. We have only had this van for 2 months and we have done 5 "test runs" to different places close by just to familiarize ourselves with every element of the van. We certainly haven't had any help from Jayco.
We will be living out of this van come May of next year. I hate that I'm finding all of these problems. But... It's better to find them out now and correct all of the issues that I can "before" we actually move into this van.
It's going to be 8 degrees again tonight and this is the temperature inside the van right now

I haven't had any issues since I fixed the exposed drain. And I hopefully won't have anymore issues while this weather holds.
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