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Thread: 2005 K1200S Coolant Reservoir Elimination

  1. #1

    2005 K1200S Coolant Reservoir Elimination

    I have a 2005 K1200S that recently began eliminating about half of the contents in the coolant reservoir when I turn the bike off when the auxiliary cooling fan is on. It only happens when the bike is hot and the auxiliary cooling fan is on. The coolant is being ejected out of the hose that exits behind the engine on the left side of the bike. Anyone had this problem? Thanks - David

  2. #2
    Registered User GTRider's Avatar
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    Quote Originally Posted by dkmbmwmoa View Post
    I have a 2005 K1200S that recently began eliminating about half of the contents in the coolant reservoir when I turn the bike off when the auxiliary cooling fan is on. It only happens when the bike is hot and the auxiliary cooling fan is on. The coolant is being ejected out of the hose that exits behind the engine on the left side of the bike. Anyone had this problem? Thanks - David
    Assuming that the coolant level haas been set correctly as per the owner’s manual, the next two items to check would be the radiator cap and the condition of the radiator itself. By that, I mean making sure the fins aren’t plugged and that the aux fan can actually move air through the radiator. The radiators on the wedge-k bikes collect a lot of crud due to their placement and some have reported corrosion issues leading to leaks. But on a 15yr-old bike a new radiator cap is the first thing I’d try.

    Best,
    DeVern
    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT — 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

  3. #3
    Left Coast Rider
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    These rad caps are kind of pricey - $43.00. Is there an OEM replacement available?

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    Registered User GTRider's Avatar
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    Quote Originally Posted by BC1100S View Post
    These rad caps are kind of pricey - $43.00. Is there an OEM replacement available?
    I’ve not found one. I note that BMW lists two different part number caps for the K1200S. One is flagged as “1.8 bar” and the other bears no value. It might be advantageous to visit with your dealer’s parts or service department to see which is recommended, in case the difference is relative to your problem. From Bob’s BMW parts fiche:

    06 17 11 7687715 Cover lid 1.8BAR 1 $43.03
    06 17 11 7695413 Cover lid 1 $34.44

    Best,
    DeVern
    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT — 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

  5. #5

    Thank you!

    Thanks DeVern. I will follow up with my shop on this. - David

  6. #6
    Registered User GTRider's Avatar
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    DGerber
    1983 R80ST — 1984 R80 G/S-PD — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT — 2018 R1200GS
    BMWMOA#52184, AMA#271542, IBA#138

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