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  1. #1
    DaveC's Avatar
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    Rotax Racing thermostat and coolant

    Replaced the stock unit with the Rotax Racing thermostat. Upon pouring the coolant back into the tank it appears that there is air in the system as the tank shows full but I still have coolant to add. How do I get the air out and the coolant in ?

    Is the mix of 50/50 still correct for the coolant and distilled water ?
    I will need to add more to replace what was spilled at various times during the swap.


    thanks !


  2. #2
    Gotta love this sport! 05Limited's Avatar
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    Dave... you'll need to run it... fill... run it... fill... run it... fill.

    It's a bit tedious, but will eventually purge all the air and show full

    Jeff
    Last edited by 05Limited; 08-08-2007 at 12:51 AM.

  3. #3

    squeeze

    squeeze all the hoses for starters

    this should free up some of that trapped air

  4. #4
    EZ Dock of Long Island Shibby1485's Avatar
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    Jeff is right!

    fill it up.... and then that 1" hose that goes from the cylinder head to the top of the thermostat? repeatedly squeeze it and pump it.... gets SOME of the air out...

    then leave the cap off the coolant bottle and run it on the hose for awhile... dno't be afraid to let it run awhile... if you hear an overheat alarm or some weird whinining or deep toned clattering (carbon seal) then turn the ski off and let it sit for 5 minutes to cool down and then go at it again.

    leaving the cap off the bottle lets the air escape easier rather than the system having to reach a point of pressure where it pukes the air out with the cap on...

    so fill the system... flush it once for like 5 minutes or more if you can get away with it and the carbon seal not screaming at you... wait awhile, and flush it again for another 5+ minutes... that should pretty much do the trick.

  5. #5
    EZ Dock of Long Island Shibby1485's Avatar
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    DIGGS beat me to it!

    yes.. 50/50 is accurate... you can even do more of a 60/40 (more water) as water cools better and the mixture is still within very safe operating properties at that ratio

  6. #6
    DaveC's Avatar
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    Thanks guys !

  7. #7

    water wetter

    maybe a little water wetter in there as well

    http://www.amazon.com/Red-Line-Synth...6552965&sr=1-2

  8. #8
    HoopsRXT's Avatar
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    Does anyone know how much coolant is required to fill the cooling system after doing a thermostat? I would just buy the pre-mix stuff to make my like easier. I am just finishing put the rotax thermostat in my ski also.

  9. #9
    DaveC's Avatar
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    When I drained mine it was only about a gallon including what was spilled

    The capacity is 5.5 L or 5 US gts. as listed in the manual.

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