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Thread: Removing air from coolant system

  1. #1
    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Removing air from coolant system

    I'm having troubles removing air from the coolant system.

    I run bike cold with radiator cap off and when engine reaches around 90C water starts to come out.
    Is this normal? Do I just repeat this until it doesn't?

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    Forum Moderator alex's Avatar
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    Re: Removing air from coolant system

    Coolant system is pressurized. Thus without the cap it ejects. You need to put it on, run the engine, elevating the radiator isn't a bad idea. But the overflow tank will need to be watched and filled as needed.

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    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Re: Removing air from coolant system

    Quote Originally Posted by alex View Post
    Coolant system is pressurized. Thus without the cap it ejects. You need to put it on, run the engine, elevating the radiator isn't a bad idea. But the overflow tank will need to be watched and filled as needed.
    I think my mistake was to run until 90C instead of until when thermostat opens. I will repeat tomorrow
    Last edited by bmwbadboy; 1st August 2020 at 04:26 PM.

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    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Re: Removing air from coolant system

    It's none issue. I'm just overly sensitive.

    But it was damn hot, oil on track is 96C!

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