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  #1  
Old 09-15-2020, 12:13 PM
Ironman2909 Ironman2909 is offline
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Join Date: Feb 2020
Boat: Mastercraft, NXT 20, 2019, ILMOR MPI 5000
Location: Canada
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Question Winterization of Heater

Good day all,

Well it's the end of the season for us back in Canada and it's time to put the boat to bed for ling winter.

I have a NXT 20 2019 and was wondering how to winterize the heater. The Owners Manual is not extremely precise on the process.

Any advices is welcomed and if you have pictures.....llike they say it's worth a thousand words!

Much appreciated!
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Old 09-15-2020, 01:37 PM
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Kennyk69 Kennyk69 is offline
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Boat: 2009 Supra SSV24, 2017 NXT22
Location: Indiana
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Drain the block and while the block plugs are removed also remove the hose that feeds the heater pump. On my 2017 Illmor 5000 that pump is on the starboard side below the rear motor mount. I adapt a 3í section of 1/2 hose and use compressed air at <40 psi to blow out the lines and heater core. The water will drain into the block and you will hear it trickle in. I then fill the core with -50 a/f using the same line. There are several other hose points that you might break free (and avoid using the extra hose) but Iíve found those to be far (far) more difficult than the hose at the pump. In the picture ( looking down) the pump is immediately below the motor mount and I come in at the hose clamp on the right side of that pump. The hose above it is the return line.
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Old 09-16-2020, 10:37 AM
Ironman2909 Ironman2909 is offline
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Awesome thanks! That is what I will do. Much appreciated!
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  #4  
Old 09-16-2020, 11:33 AM
jgraham37128 jgraham37128 is offline
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Boat: 2016 Mastercraft X23
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I do the same thing, blow it out using one of the hoses and the water will flow out of the block drains.

I hear its the first thing to freeze up since its so thin.
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