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Thread: '94 K1100LT Thermostat Bad????

  1. #1
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    '94 K1100LT Thermostat Bad????

    I think my thermostat on my "94" K1100LT is not working. Temp gauge raises and then fluid squirts out the vent hole on the reservoir cap. I took out the thermostat, put it into 185 deg. water and it did not open until the temp reached 200. So I'm thinking it could be a bad thermostat. Someone mentioned that it could be the cap. ????? Fluid is getting back into the reservoir so how could the cap be bad???? Does anyone know if a generic (non BMW) would work and which one? Taking a trip to New England in 2 weeks.

  2. #2
    3 Red Bricks
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    Please read:

    http://www.bmwmoa.org/forum/showthre...r-thread-title!

    I've added that info to the title of your thread.





  3. #3
    3 Red Bricks
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    Does your fan function properly?

    Is the radiator full AT THE RADIATOR CAP (underneath the front of the gas tank)?

    Is the hose between the radiator cap and the coolant overflow tank cracked?




    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  4. #4
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    Thanks for the redirect.

    Yes the fan comes on.
    Radiator IS full at the cap.
    No the hose to the over flow container not cracked. Expansion fluid goes back INTO reservoir tank when it gets hot.

  5. #5
    Registered User 58058D's Avatar
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    When the gasket in the radiator cap for my '93 K1100RS was deformed, it would allow fluid past prior to the cap actually opening to allow fluid into the overflow, which filled up and spewed out. This only happened when I stopped....but as I was on a trip to Colorado from Sacramento, that was a real pain. It did exactly as you describe. The temporary fix was to remove the gas cap, pull that gasket and flip it over. This solved all my problems. Though, I picked up a new gasket (or maybe new cap with gasket, but I doubt that) when I got back home. And, no, a generic cap would not do. The cap is designed for a specific pressure to build up before it lets fluid past. If the generic cap does not open at the appropriate pressure, you could have a bigger and more expensive mess on your hands. You might also flush out all the dust and bugs stuck in the raditor by using a hose from the rear....that helps keep the radiator cooling as it should.
    Jim Douglas '00 K1200RS >135,000 miles my primary bike again,
    Gone: '09 K1300S sold @ 22k mi, '93 K1100RS traded @ 78k mi, '85 K100RS sold @ 44k mi
    '06 Kaw 650R track bike sold
    http://www.seagullbb.com/

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