Winterizing the 2013 Moomba Mobius

Winterizing the 2013 Moomba – Part 1

Draining the water out of the hoses and engine block.

To winterize the 2013 Moomba takes some physical agility and a little knowledge of mechanical tools like using a screw driver and ratchet set! Really it is fairly easy once you see how to do it.

You will:

Remove 6 clamps holding hoses that you have to drain (8 if you have a heater installed on the boat). Take out 2 stopcocks on the engine block to drain.


Tools you will need:

Rachet Set

Flat head screwdriver


Hair dryer with heat setting

Optional: Air compressor



Step 1 – Open the back hatch of the boat to expose the engine block. Open the side walls by twisting the small clamp on top of the walls so it falls open. Reach under the block to find the bolt pictured below on either side of the block. Using the ratchet loosen the bolt, remove it and let the water drain out of the block. When the water has drained out, screw the stopcocks back on and tighten with the ratchet.

Stopcock Mooba

Step 2 – Under the back seat, take off the engine cover that sits under the back seat and set it aside. There is one hose (see arrow #1) that is connected like a garden hose and another hose (see arrow #2) with a clamp that needs to be loosened using a flat head screwdriver. Open these hoses up and drain the water out. When all the water is drained, tighten them again.


Hose disconnection

Step 3 – In the port quarter engine compartment you will find a slanted C shaped pipe that needs to be drained. There are clamps at the top and the bottom that attach the hose to the engine block. With a flat head screwdriver, loosen only the clamps that are closest to the engine block on both top and bottom. Pull the pipe off and drain the water. Reposition the pipe, making sure it is tight against the block again. Tighten the clamp as it was originally.

Pipe removal for winterization


Step 4 – On the starboard quarter of the engine compartment there is another C shaped pipe that needs to be drained. Loosen the clamps and drain. Reassemble.




That’s it!  Unless you have a heater—-


Winterizing the Heater System:

The secret tool for the job: The blow dryer!


Conair blow dryer with hot heat setting


To winterize the heater system you’ll find there are two clamps on either side of the hose that leads to and the heater and back to the engine block.

See the picture below for location of the upper heater hose and the lower heater hose on the port quarter of the boat. Using the flat head screw driver, loosen the clamps on either side and slide them down the hose.

Winterizing Boat heater system

Winterizing heater system in Moomba

The ends of these hoses can be very difficult to pull off the engine block attachment. Using a blowdryer, set on the hot heat setting, heat up the hose for a few minutes and it will slide off the block much easier. The reason why the hose is difficult to get off without heating it up is that the block attachment has deep gripping grooves that hold on to the hose and heating the hose allows it to expand enough to slide off.
Once you have both ends of the hose off, take the upper heater hose and blow very hard through it. You will see the water coming out of the lower heater hose as you do this. Continue blowing until you don’t see any more water coming out and you don’t hear any gurgling water. If you don’t see water coming out but hear a airy gurgling sound, continue to blow until you hear only dry air.


An alternative to mouth blowing is using an air compressor to blow the air through the hose. This is obviously an easier, faster solution if you have an air compressor!


Slide the hoses back on. If they won’t go back on, heating the hose up with the blow dryer will make it go on easily again. Tighten the clamps on both the upper and lower heater hoses and you are done!


Coming soon…How to do an oil change in the 2013 Moomba






6 Replies to “Winterizing the 2013 Moomba Mobius”

  1. Thanks so much for a well done explanation of how to winterize a 2013 Moomba. The pictures were excellent and the arrows really helped to pinpoint what was being described. It is so nice to be able to do this myself and not take all the time, and money, necessary to bring it to a dealer. It is very much appreciated.

    1. Kevin,

      Thanks for the feedback. Unfortunately our web host experienced issues and we’ve lost some of the photos. We’ll try to take some new ones and post them when we winterize this year.

  2. This was a great help. With the early arrival of winter, I was concern I wouldn’t be able to bring the boat to the dealer for the servicing and winterization. I followed your instruction and now I am confident, the engine won’t freeze and crack. I am no mechanic but this was as easy as it can be. THe picture are also very clear and I found everything I was looking for. Even the air blower trick worked fine.

    I live 4 hours away from the only dealership who will work on a Moomba. They are very good.

    1. Derek,

      If you run anti-freeze through the engine you shouldn’t need to drain it. The last few years, we’ve begun exclusively running anti-freeze through as it’s easier and we’re less likely to miss something.

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