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Old 05-14-2020, 04:01 AM   #1
Join Date: Aug 2018
Location: Southern Maine
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Quick question. When my unit was winterized, they used the fresh water tank and pump, so there is some antifreeze in the fresh water tank. I will be on campground (city) water this year all year. Since I will be using that source, can (should) I just leave the antifreeze in the fresh tank?
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Old 05-14-2020, 04:31 AM   #2
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I wouldn't ! Besides, usually you sanitize your water system using the fresh water tank, and always good to have a few gallons of water in it while you travel for any road side breaks.
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Old 05-14-2020, 05:36 AM   #3
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I'd flush the antifreeze out of of the FW tank because it'll leave a strange taste.
There's NO need to put antifreeze in the FW tank.
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Old 05-14-2020, 07:47 AM   #4
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Originally Posted by bikendan View Post
I'd flush the antifreeze out of of the FW tank because it'll leave a strange taste.
There's NO need to put antifreeze in the FW tank.
We have a Sunseeker class C. The fresh water tank is not accessible, under the bed and is gravity filled. The outlet from the tank is on the side of the tank as close to the bottom as possible. The waterline from the tank goes rearward a foot, drops a few inches, then runs maybe 6 feet across to the other side of the motorhome and drops a foot to the water pump. When I winterize, how do I ensure this line does not freeze up? If I put some antifreeze in the FW tank, I could get antifreeze into this line. If I attempted to blow it out, the FW tank would need to be totally empty, and perhaps would I need to insert a new tee in the line just before the pump to avoid fruitlessly trying to blow backwards through the pump?

In summary, I keep hearing not to put AF in the FW tank, but I’m unsure how to protect the line going from the tank to the remotely located pump. Any advice?
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Old 06-11-2020, 08:27 PM   #5
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seems to me that if you just ran the pump until it ran dry that would take all the water out of that line. open the fresh water tank drain to (hopefully) empty the tank. you may not have a antifreeze inlet port installed so they put antifeeze in the fresh water tank and used the pump to get it into the plumbing lines. if you do not have a separate antifreeze inlet port spend a few dollars for a kit and install one so you don't have to put antifreeze into the fresh water tank.
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winter, winterizing

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