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  1. #1
    Cashito's Avatar
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    Replacing Coolant: Necessary To Flush?

    I recently found the clamp below my expansion tank was broken so I decided to take the opportunity to replace the coolant. I have been reading the service manual which details a pretty comprehensive flushing of the cooling system. I'm wondering if this is overkill. I'm at 80hours.

    Here are the directions:

    1) Drain the cooling system. clean thoroughly using the Valvoline Zerex Super Cleaner (or equivalent)

    2) Add the cleaning product in coolant expansion tank then fill cooling system with demineralized water.

    3) Reinstall cap on coolant expansion tank

    4) Install watercraft in a water tank or ride on a water plane. Start engine and run for approximately 15 minutes mostly at full throttle.

    IMPORTANT: Ensure themostat opens so that the cleaning product flows in ride plate properly.

    5) Stop engine and let the clenaing product work for 12-16 hours.

    6) Thereafter engine can be run one last time to soak off deposits

    7) Drain and thoroughly rinse the cooling system with clean, fresh water

    Refill cooling system as describe below.... etc


  2. #2
    Big K's son KeithKman's Avatar
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    My skis have 104 hours. I'm just draining the system and refilling with a 50/50 mix.

  3. #3
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    Last edited by cjhoward; 04-20-2015 at 07:39 PM.

  4. #4
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    Last edited by cjhoward; 04-20-2015 at 07:40 PM.

  5. #5
    canuck's Avatar
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    If the coolant is old then I like to drain the system then fill with distilled water run it until the themostat opens and drain again then refill with a 50/50 coolant distilled water mix.


    If you are changing coolant because of a head gasket leak or have some other contaminents in the system then it would be a good idea to do the complete flush as per the manual.

  6. #6
    Faflux31's Avatar
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    Hello everyone,

    I had an issue with my coolant which has started to boil yesterday. I just bought the ski so I would like to replace the coolant and flush the system. BRP recommend to use the Valvoline Zerex Super Cleaner but I cannot find this product in my country (France). Maybe you can help me to find an equivalent product? Which cleaner do you use?

    Thanks

  7. #7
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    Using the cleaner is overkill if replacing as per maintenance. I simply remove the cap, raise the front end of craft, drain from rear bolt, add 50/50 antifreeze till bubbles and then some stops coming from the drain, fill it to top. Summer time, bring a liter of antifreeze while driving off to warm up, carefully add as needed after cooling down. You will have plenty of cooling in the system if you fill the bottle full before warming up.

  8. #8
    3ftDeep's Avatar
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    According to the hours it's a bit too early, but depending on the age of your machine it could be an appropriate time. Check out this video to help out: .

  9. #9
    Faflux31's Avatar
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    Thank you for your advices. My ski has 140hours (2007 RXT).
    I emptied the system and the coolant was dirty. (it looked like milk)
    I have cleaned the system with distilled water as it is explained in your video. So, you do not think that it is not necessary to use a chemical like valvoline Zerex to clean the ride plate properly?
    Thanks

  10. #10
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    Quote Originally Posted by Faflux31 View Post
    Thank you for your advices. My ski has 140hours (2007 RXT).
    I emptied the system and the coolant was dirty. (it looked like milk)
    I have cleaned the system with distilled water as it is explained in your video. So, you do not think that it is not necessary to use a chemical like valvoline Zerex to clean the ride plate properly?
    Thanks
    Wondering if you have a head gasket or seal problem on the engine for it to look like milk..
    Mine always come out as clean as the fresh coolant I put back in. Perhaps you can have a sample of that milky looking coolant tested for motor oil within it to rule out a block leak..

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