Partially Winterizing Fresh Water System

Discussion in 'Winterizing' started by bbwhitejr, Nov 12, 2017.

  1. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    I want to partially winterize my freshwater system and I need some validation of my idea or other suggestions. I want to remove water from the anchor locker line, transom locker line, transom shower, and the washer/dryer supply lines.

    I have a water manifold and a “key” to turn each small valve off/on for each line. If I just cut off the valves going to the lines I want to drain and then open the spigots, I am afraid they will not drain due to forming a vacuum. My thought is to hook up an air compressor with low pressure, open one outlet at a time and remove all water from the freshwater system. Then close the valves to the lines I do not want water in before turning the water back on.


  2. doozie

    doozie Member GOLD Sponsor

    Dec 6, 2007
    46 sundancer 2001
    3126B 450hp Cats
    I have used air for years, never an issue and we get a little colder than you. If you have a hot water bypass that makes it easy
  3. fred castner68

    fred castner68 New Member

    Nov 12, 2017
    1989 280 sundancer
    mercruiser v-6 twins
    I have a 280 sundancer 1989 and I am in the process of winterization of the water systems, A/C cooling,hot water, and toilet sea water inlet. On the hull I have one fresh water pick up and 1 sea port for the holding tank. Does the inlet serve both the toilet and A/C ?
  4. importmonkey

    importmonkey Opinionated Member

    Jul 9, 2015
    Middle River, MD
    2007 44 Sundancer
    QSC 500s
    Why not close the lines you don't need to drain, open the ones you want to drain, force air through the system, close the empty lines, then open the full lines?

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