Coolant Overflow "Mystery" (?) - K-Bikes.com - Excellence in Motion
 
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post #1 of 6 (permalink) Old May 10th, 2007, 12:50 pm Thread Starter
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Coolant Overflow "Mystery" (?)

I've been riding the Blue Beast to and from work almost every day since last July. I've ridden in temps ranging all the way up to 105*f. Last few days have been in the 90*s. The cooling system has always kept up.

This cool morning I rode in... no symptoms. (Insert disqualifier here -->) Gauges good as best I can remember...

Two hours later I walk past bike and see a large puddle of coolant on the ground under the center stand, with top of coolant overflow tank wet and weepy. Level in tank is now down at 'MIN' and a few days ago was close to 'MAX'.

I'll start it later, leave it parked, and wait to see if radiator fans are coming on. Other than that... Ideas? Comments?

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post #2 of 6 (permalink) Old May 10th, 2007, 1:08 pm
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Radiator cap replacement is due!:wtf I know it does not make much sense other than they do fail.

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:wtf Joel Callan :wtf
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post #3 of 6 (permalink) Old May 10th, 2007, 1:13 pm
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I have had that happen to me before. The tank seems to self-level about half way between Max and Min.
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post #4 of 6 (permalink) Old May 10th, 2007, 1:25 pm Thread Starter
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Quote:
Originally Posted by 03k12RS
Radiator cap replacement is due!:wtf I know it does not make much sense other than they do fail.

Rats! I laugh at people who don't search topics before they ask questions...

I've done it twice in a week! I am SOOOO sorry. :banghead

For those interested..

http://www.k-bikes.com/forums/showth...hlight=coolant

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So Big, and My Boat is SO Small"

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post #5 of 6 (permalink) Old May 10th, 2007, 1:31 pm
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Dave, I think Joel has it right. My '03 did that from brand new, and I couldn't figure it out. Someone on the board mentioned that there were some bikes which came out of the factory with radiator caps with the wrong pressure rating. I took it in to the dealer, and the head wrench confirmed that it had the wrong cap. Problem solved, and it never happened again.

I can't imagine how you could have the wrong cap all this time and the problem just now surface, but I think it's possible that the seal on your cap has decided to retire. The symptoms are the same.

When the bike is cooling, the bad seal allows air to be sucked into the radiator (taking up volume). Then, just after you've ridden your bike and shut it down, the temp goes up at first because the fans are not on and nothing is circulating. When the temp goes up, the bike pisses itself through the overflow because of the extra volume caused by the sucked in air.
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post #6 of 6 (permalink) Old May 11th, 2007, 1:41 am
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Hi, my K1200rs did the same a couple of months ago, I raised the seat so it did not touch the cap and as by magic no more leaks !
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