BMW F800GS 2010 engine cooling system problem

Discussion in 'Parallel Universe' started by michael205, Mar 1, 2020.

  1. michael205

    michael205 Adventurer

    Joined:
    Mar 24, 2017
    Oddometer:
    17
    Hi, first and foremost, english is my second language so i might write weird sh * t. bear with me :)
    I have a problem with cooling system. It's NOT overheating, it's the opposite...
    It's allways with 2 "lines", sometimes 3 but only on intersections.
    From what i know there are two "circuits" for coolant to take, small one and big one with radiator.
    It looks like it allways use big circuit and with temp 4-10*C (40*F ?) it never reach engine normal work temp.
    It might not be a problem in summer but not it is.

    What should change to get it work as it should ?
    #1
  2. Indy Unlimited

    Indy Unlimited Long timer

    Joined:
    Jan 21, 2007
    Oddometer:
    1,960
    Location:
    Parker, CO
    #2
  3. JRWooden

    JRWooden Homeless motorcycle vagabond ... and ... loving it

    Joined:
    Jul 5, 2008
    Oddometer:
    6,490
    Location:
    The great state of confusion
    I have a similar problem and will be replacing my thermostat soon.
    From feeling the radiator it appears the thermostat is stuck open or partly so.

    I need to sit down with the parts list to see what o-rings and other parts are needed.
    Also I will replace the radiator cap as well just because it's the original unit.
    The thermostat is item #3

    https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=51596&rnd=07242017

    upload_2020-3-1_13-13-11.png
    #3
  4. michael205

    michael205 Adventurer

    Joined:
    Mar 24, 2017
    Oddometer:
    17
    Thanks for fast replays,
    I will check termostat and if it's not it then sensor.
    When i leave motorcycle running idle it will get hot 3-4 "lines" , only when riding will temp go down so i would bet that thermostat is faulty.

    https://boxer-parts.eu/radiator-thermostat , it's not expensive 37 euro + 5 euro o-ring.
    #4