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Old 09-07-2010, 05:29 PM   #16
JoelWisman
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This does not sound good. I would take the bike in for warranty service. Even if the dealer does not find anything, a record will be created that you have reported a problem.

I would do this before doing any diagnosis on your own because because this could be something bad.
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Old 09-07-2010, 06:38 PM   #17
lmclamore
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I spoke to George over at Beemers Uber Alles this evening. He suggested it may simply be a problem with the rad cap. Reasoning that the coolant gets hot, expands into the catch tank, and is possibly getting caught (no pun) there unable to get drawn back in to the system when cool. The cap looks OK and I have it soaking for now. I'll try putting everything back together tomorrow PM, bleed the air out of the system, and test it close to home. George's also thinks there is the possibility of a bad water pump. I sure hope not. Not looking forward to having the bike down for so long.
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Old 09-11-2010, 09:03 AM   #18
JRWooden
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Quote:
Originally Posted by JoelWisman
P.S.

The factory method does not always work for getting the air out of the cooling system and the bike does not self bleed at all.....
Joel:

One of the other inmates pointed out that there is a T30 sized cap screw that "vents" the cooling jacket. It is located on the front of the cylinder housing about two inches above the starter on the left-hand cylinder. I don't think the manual mentions this screw, but ... I'm not sure why else it would be there besides helping drain/flush/fill the cooling system?

Any thoughts?
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Old 09-11-2010, 09:16 AM   #19
lmclamore
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I am waiting to find out if my bike will be ready today. Morton's BMW (Fredericksburg VA) also assessed my problem as a bad radiator cap. The hour in traffic to get home will be a good test.
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Old 09-13-2010, 10:20 AM   #20
supershaft
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Quote:
Originally Posted by lmclamore
I spoke to George over at Beemers Uber Alles this evening. He suggested it may simply be a problem with the rad cap. Reasoning that the coolant gets hot, expands into the catch tank, and is possibly getting caught (no pun) there unable to get drawn back in to the system when cool. The cap looks OK and I have it soaking for now. I'll try putting everything back together tomorrow PM, bleed the air out of the system, and test it close to home. George's also thinks there is the possibility of a bad water pump. I sure hope not. Not looking forward to having the bike down for so long.
Anything is possible but joel hit it mostly on the head in that they can be a mofo to bleed. The bottom line is to watch it after you change coolant! Do not go by what is in the expansion tank!
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Old 09-13-2010, 03:26 PM   #21
lmclamore
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My dealer also went the "bad radiator cap" route, replaced it, topped her off and 150 miles later...everything is working as it should.
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Old 09-13-2010, 06:24 PM   #22
ThinAir
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Hack Method of refilling

Right or wrong, after I replaced my wife's 650 twin's radiator I too ran into the red triangle and found the fluid level low from not properly bleeding the system. I simply let the bike idle with the radiator cap off, while watching to make sure the bike was not overheating, and just filled the radiator a little at a time until it maintained a level near the neck of the fill area. Yes it burped out some fluid from time to time and got some drips here and there, but once I did that then filled the reservoir after placing the cap back on the radiator, it has been fine since. Simple, effective, and probably way wrong!!
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Old 01-24-2013, 08:30 AM   #23
EnderTheX
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Quote:
Originally Posted by ThinAir View Post
Right or wrong, after I replaced my wife's 650 twin's radiator I too ran into the red triangle and found the fluid level low from not properly bleeding the system. I simply let the bike idle with the radiator cap off, while watching to make sure the bike was not overheating, and just filled the radiator a little at a time until it maintained a level near the neck of the fill area. Yes it burped out some fluid from time to time and got some drips here and there, but once I did that then filled the reservoir after placing the cap back on the radiator, it has been fine since. Simple, effective, and probably way wrong!!
Any follow up on this method?... How did it end up?


Anyone got more stories of bleeding the coolant system?
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