Coolant System Vacuum - K-Bikes.com - Excellence in Motion
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post #1 of 5 (permalink) Old Jun 10th, 2019, 3:23 pm Thread Starter
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Coolant System Vacuum

Well, I'm changing the coolant for the first time and the system will not hold vacuum. I have an obvious leak from the reservoir cap (the one on the left side of the bike above the shifter). Anybody else have this problem? I suppose I need a new cap. 17k miles. Never had a cooling problem with the bike.

Chambersburg, PA
2008 BMW K1200S
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post #2 of 5 (permalink) Old Jun 10th, 2019, 6:32 pm
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Have you blocked of the overflow drainhose going from expansiontank to underside of bike?
And also the small hose at the radiatorcap should be blocked off.
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post #3 of 5 (permalink) Old Jun 10th, 2019, 7:06 pm Thread Starter
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Quote:
Originally Posted by Mattias_r View Post
Have you blocked of the overflow drainhose going from expansiontank to underside of bike?
And also the small hose at the radiatorcap should be blocked off.
Yes, I had both of those clamped off. When pulling vacuum, the expansion tank itself should be under vacuum, right? I can hear air slowly being sucked around the cap. Sounds like a whining noise for about 3 seconds and then no vacuum.

Chambersburg, PA
2008 BMW K1200S
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post #4 of 5 (permalink) Old Jun 10th, 2019, 7:36 pm Thread Starter
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Quote:
Originally Posted by Mattias_r View Post
Have you blocked of the overflow drainhose going from expansiontank to underside of bike?
And also the small hose at the radiatorcap should be blocked off.
Ok, now I'm thinking that the hose next to the radiator cap goes into the expansion tank. So obviously the clamp I'm using isn't doing the job. Thanks for the help. I'll report back.
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Chambersburg, PA
2008 BMW K1200S
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post #5 of 5 (permalink) Old Jun 11th, 2019, 12:07 pm Thread Starter
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Ok, problem solved. I had the wrong hose clamped underneath the bike. Coolant is in, now just need to bleed it. Thanks!
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Chambersburg, PA
2008 BMW K1200S
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