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Old 03-06-2015, 04:27 PM   #15
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I didn't notice you have an Interstate since it wasn't in the info on the left and thought "AI" in the text was "artificial intelligence". I hadn't known robots posted here, though there are some dogs. But, Protagonist's post may be better because he has AI as well.

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Old 03-07-2015, 03:53 AM   #16
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Ha! That's what I thought when I joined the forum but AI here means airstream interstate... When in Rome.
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Old 03-07-2015, 05:45 AM   #17
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Only way I am able to get all the water out of our MoHo and Airstream for winterizing is to blow the system out using a compressor. I blow everything, including the hot water heater, then use the by pass valves on the hot water heater and blow the lines and pump again. Then add anitfreeze to the traps only, not throughout the system. I've never had an RV freeze in over 45 years of doing this.

Un-winterizing is simply a matter of using the system. If you use RV anti-freeze in the system I would run water until clear and then open the hot water heater by pass.
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Old 03-07-2015, 10:16 AM   #18
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Then add anitfreeze to the traps only, not throughout the system. I've never had an RV freeze in over 45 years of doing this.
An Airstream Interstate has no traps; in place of drain traps there are one-way HepvO valves (HepvO Waterless P-Trap, How big is it?) so you don't need to add antifreeze to displace the water in the traps; there is no water in the traps. Nevertheless it's still a good idea to add at least some antifreeze to the black and gray tanks to cover the waste dump valves with antifreeze and keep the seals moist.
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Old 03-07-2015, 11:58 AM   #19
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How about the toilet valve and sink sprayer?—I always run antifreeze through them after forgetting one year and both of them froze and broke. I am unsure whether I blew them out with a compressor that year, so that may be enough. And some antifreeze in the toilet bowl to keep that seal happy.

For summerizing, I use Clorox in solution to clean the fresh water tank and system, then flush it 2 or 3 times until the odor of chlorine gores away. The proportion of Clorox to the size of the tank should be in the owner's manual.

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Old 03-07-2015, 12:32 PM   #20
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Dunno if Interstate has room butů..

I use a port potti when I winter camp. You can dump it in any toilet, and avoid costly repairs to the RVs plumbing.
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Old 03-07-2015, 01:48 PM   #21
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The good thing about RV antifreeze is that it doesn't evaporate so a small amount in the black tank keeps it from drying out.
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Old 03-07-2015, 03:29 PM   #22
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An Airstream Interstate has no traps; in place of drain traps there are one-way HepvO valves (HepvO Waterless P-Trap, How big is it?) so you don't need to add antifreeze to displace the water in the traps; there is no water in the traps. Nevertheless it's still a good idea to add at least some antifreeze to the black and gray tanks to cover the waste dump valves with antifreeze and keep the seals moist.

How long do those traps last? Have you experienced any problems with them?
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Old 03-07-2015, 03:29 PM   #23
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How about the toilet valve and sink sprayer?Gene
I just learned my lesson the hard way. I assumed that the toilet valve was high up enough that simply opening the low-point drain would empty it when winterizing. Nice idea, but bad decision. When I went to "summerize" the Grand Tour last week, prior to a short run to Florida (to escape the cold, no less), I found out that the sound of running water when I connected the shore water line was caused by a huge leak around the back of the toilet. $280.00 later (freezing not covered by warranty), I had a chance to look at the old valve. Turns out that there are a load of channels and ports in the valve that trap water and freeze even after a standard winterizing. Lesson learned, I will now pump antifreeze until it comes out in the bowl. I did that the first time I winterized, but got lazy the second time. BTW, the part is not expensive, it's the labor. Can anyone help me as to how to remove the toilet? I have a feeling this will happen to me again, and I want to do the labor myself. At least it's MY toilet, so it won't be THAT bad a job.
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Old 03-07-2015, 06:12 PM   #24
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How long do those traps last? Have you experienced any problems with them?
Longer than I've owned my Interstate at least, and no problems at all.
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Old 03-07-2015, 07:36 PM   #25
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Billy, when I was summerizing and the toilet valve had frozen, I had a fountain in the bathroom when the water was on. While it may have been pretty, I mostly only cared about running back to the faucet and turning off the water. Since then—6 or so years—I've always remembered to pump antifreeze through the valve and had no problems since.

I was going to JC for some other things and they fixed it no charge. But I was there and getting other things done. You have to pull the toilet to get to the valve. I talked to an RV mechanic in Grand Junction before I went to JC and he quoted me a price of $150. Maybe the Interstate has complications, or maybe because this guy wasn't at an Airstream dealer it cost less.

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Old 03-09-2015, 07:14 PM   #26
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How long does it take to flush out the antifreeze once winter is done? Thanks
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Old 03-09-2015, 09:31 PM   #27
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Takes me about a half hour.
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Old 03-10-2015, 01:22 PM   #28
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Depends how much antifreeze is in the system and whether the taste remains of either antifreeze or chlorine. Some people report the antifreeze taste lives on and on—I don't know whether they are hypersensitive or it is the brand of antifreeze. I flush the system 3 times after using Clorox and that's gets all bad tastes out. Since we have a 39 gallon tank and longer water lines that an Interstate, all of this takes longer—several hours. Draining the system between flushes goes faster if you run the water pump when draining.

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