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Thread: No Antifreeze

  1. #1
    Join Date
    Jun 2018

    Default No Antifreeze

    2017 Mojo Raptor 400
    I got it out from storage today. Checking things over notice thereís no antifreeze in it. When I winterized it I changed oil. Thereís no antifreeze in oil or anything like that. I havenít started it yet but I plan on putting some in before I start it. It didnít get hot or anything when I winterized it either.

  2. #2
    Join Date
    Jan 2021
    Columbus, Ohio


    I assume you have a heater based on this info.
    Please check the heater box under the seat and then the pump under the transmission dog house.
    They are known to leak and they use the engine antifreeze circuit to create the heat.

    The floor would be sticky from the leak. Antifreeze leaves a residue after it drains.
    2015 Moomba Mojo Surf Edition
    Manual Flow

  3. #3
    Join Date
    Apr 2013
    Knoxville TN


    Donít run the motor too long with low coolant.

    Grab a bottle of the right coolant, fill it up, and run it to see if you can find the leak.

    Mine had a slow leak on a heater fitting. Dealer even had an issue finding it. So the boat was usable, but would get low after a handful of trips.

    Sent from my iPhone using Tapatalk
    2018 Supra SL400

  4. #4
    Join Date
    Aug 2018


    Even better buy a vacuum filler. Creates a vacuum in your coolant system and helps you find the leak. Also I found out when I drained my system that when filling the raptor engine itís hard to get the air bubbles out. The vacuum filler fixes that problem.
    2016 Mojo surf edition
    1100lbs rear w/ 475lbs piggyback mid/ center 700lbs/ 500lbs IBS/ 600 lbs lead
    ACME 2315

  5. #5
    Join Date
    Jun 2019
    Knoxville, TN


    Mine starts that way every season also, and once I add some, itís fine. When I start the boat, it sometimes ďburpsď back into the reservoir to a higher level also.

    Sent from my iPhone using Tapatalk
    2016 Moomba Mojo Surf Edition
    1100s in rear lockers
    400 Raptor

    2002 Supra Launch SSV - Sold

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