Coolant replacement - help





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  1. #1
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    Default Coolant replacement - help

    When replacing coolant, how do I ensure that the system drains completely?
    After flushin the system,I removed the bottom pipe of the radiator and let it drain completely.
    When I then filled up with water to remove all cleaning stuff, I could only get about 6l into a 8l system!
    Must the engine be running when flushing or what?
    Don't want anything to go FUBAR on me!!

  2. #2
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    Default Re: Coolant replacement - help

    Did you open the heater system?

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  4. #3
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    Default Re: Coolant replacement - help

    Remember that the thermostat is closed when its cold. It could hold back some coolant.
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
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    Default Re: Coolant replacement - help

    Heater disconnected - I hate heaters!!
    Ek maak vol met 2l bottels wat regop in die radiator staan, met die idee dat dit stadig inloop.
    Water gets time to warm up.
    Ek wil net al die gorros wat in was, uitkry!
    Is al besig van 10:00 af!!!

  6. #5
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    Default Re: Coolant replacement - help

    Eish. I would have bought radiator flush. I might be wrong though.
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    Default Re: Coolant replacement - help

    I do not know which vehicle and I would not know the filling details required but make sure that you follow the steps to the T how to fill up. Some vehicles have special procedure - our friend at one time learned that the hard way.

    On simple old cars I took the car on the street with cold engine. Opened heater on full, removed the bottom pipe, removed the thermostat, put water using hose pipe through the bloc and radiator until clean, closed up, put fluid in, moved the car in, let it idle heater on full, cap open and filled up as required (Thermostat had to open). The last step was to wash the street. "New vehicles" - I do not do anything.

    Filling up and checking fluid level problems I learned also with SWAMBO's Neon. Having fluid in the water bottle doesn't mean that there is water in the engine and the radiator. Luckily did not blow the engine.
    Jouko
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  8. #7
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    Default Re: Coolant replacement - help

    Have done the radiator flush thing, I want to make sure that nothing is left in the system before filling up with antifreeze!

  9. #8
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    Default Re: Coolant replacement - help

    Laat die enjin luier tot die termostaat oopmaak. Dan kan die water sirkuleer. Sit af en laat afkoel. Drein. Herhaal tot jy dink alles is uit.

    Ek spoel gewoonlik alles wanneer ek termostaat vervang. Terwyl die termostaat uit is, druk die tuinslang (met 'n lap om af te seel) in die onderste pyp en spoel.

    NB. Maak seker daar is nie plekke waar lug vasgevang is nie. Daar is stelsels wat eers gebloei moet word voor jy kan start.
    Last edited by KobusDJ; 2020/06/27 at 03:44 PM.
    Kobus

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  11. #9
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    Default Re: Coolant replacement - help

    Just flush out whatever water comes out when bottom pipe is removed, fill with clean water and connect pipes again.

    Drive car till engine warms up and thermostat opens. Let cool again, then flush again to get the rest out, then put new antifreeze and water in.
    Last edited by WAJ; 2020/06/27 at 03:43 PM.
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  12. #10
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    Default Re: Coolant replacement - help

    Thanks all!
    Gaan nou eers 'n vleisie en ysie deurbewe!
    To be continued tomorrow, next week, whatever!

  13. #11
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    Default Re: Coolant replacement - help

    Most engines have a threaded plug on the side of the engine block, this will enable you to drain it completely.
    As the bottom hose is higher than the lowest cooling passage.

    But I don't use it.
    I remove the hoses that go to the radiator and with a nozzle I flush the engine with clean water.
    I do it into both pipes.
    I also flush the radiator in both directions.

    This removes almost, I'd say 99%, of the old water and coolant.
    But you will still have water in the engine.
    So when adding antifreeze, you must do your premix carefully to ensure that you can get all the required antifreeze in.

    When buying premixed antifreeze you will be diluting it more with the water still in the engine.
    Last edited by jfh; 2020/06/27 at 09:16 PM.
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  14. #12
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    Default Re: Coolant replacement - help

    Oh you are a wise man.
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  15. #13
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    Default Re: Coolant replacement - help

    Thank you kind sir.
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  16. #14
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    Default Re: Coolant replacement - help

    Wich way does circulation take place?
    I assume it is from the radiator, waterpump, through the engine and back to the radiator.
    Is that correct?

  17. #15
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    Default Re: Coolant replacement - help

    Quote Originally Posted by Lappies Labuschagne View Post
    Wich way does circulation take place?
    I assume it is from the radiator, waterpump, through the engine and back to the radiator.
    Is that correct?
    Correct
    Robert

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  18. #16
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    Default Re: Coolant replacement - help

    End of story.
    Removed the thermostat, fixed hosepipe and ran engine for a couple of minutes.
    Replaced everything and let engine cool down.
    Filled with 3l antifreeze but could only add 2l water whith engine running.
    I will check level constantly and top up when needed.
    I want to see how much of the 8l capacity the engine will take.
    (OCD - if it says 8l it must be 8l!)

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