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Coolant issue maybe

Discussion in 'Problems, Fixes, Tips...' started by AFR0N1, Jan 15, 2022.

  1. AFR0N1

    AFR0N1 Copenworld Regular

    Mar 22, 2018
    East Midlands
    Daihatsu Copen L880K (KMVZW)
    I think I may have a cooling problem.
    After a long drive I notice my reservoir tank is full (it's normal for the level to increase with temperature I think) but it never goes back down. It stays full even after the engine has cooled (even after multiple days of not driving). This leaves my radiator empty when I check it.

    When I empty the reservoir back into the radiator until it is full, the reservoir is back to the low mark, so this shows me I'm not loosing any coolant as I don't need to add more. It's just that the coolant eventually migrates to a new location and gets stuck there.

    The temp gauge has never showed overheating.
    The heater still blows hot.

    Any suggestions?
  2. BarnsleyRob

    BarnsleyRob Copenworld Veteran

    Feb 2, 2017
    South Yorks
    2009/59 silver Copen 1298 cc (now gone to a new home)
    Sounds like an air lock. Did you burp the radiator after changing the coolant recently ? It just involved running the engine from cold with the main radiator cap off to allow air to escape.

    Don’t run the engine and then remove the cap or you’ll hurt yourself quite badly.
    AFR0N1 likes this.

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