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Old 11-18-2012, 04:30 PM   #1
bgpowe
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Radiator fluid unusual leak

My '05 CVO, is acting very weird with regards to radiator fluid leaks. I ride my bike, no leaks. Park my bike one night, two nights, with no leaks. Any longer than that, and over night, I get up and have a small puddle. Anyone ever ave this happen?


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Old 11-18-2012, 04:34 PM   #2
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check all the clamps and make sure they are tight.
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Old 11-18-2012, 04:50 PM   #3
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You sure its radiator fluid? I would have expected the leak to be noticeable as soon as you parked up.
Neighbour's dog (or the neighbour) is my bet
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Old 11-18-2012, 05:11 PM   #4
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I have bigger fish to fry, but out of no where I too have what seems like a coolant leak... very small pudddle on right side, almost seems to be coming from the break bewteen the upper and lower rads??? ugh!
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Old 11-18-2012, 07:52 PM   #5
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It is radiator fluid, for sure. Just odd that it only seems to happen after the bike is parked for a few days. In between tat time nothing.


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Old 11-19-2012, 12:52 PM   #6
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Where does the over flow hose from the over flow tank end at?

If you can elevate that, see if the leak stops.

If the leak stops, you may have a bad gasket on the radiator cap.

When heated it works the way it is supposed to, when cool, the gasket looses it's ability to allow a tight seal, allowing overflow to occur.

Then the overflow hose (located at the center of the radiator and is cable tied in 2 locations on my 02) has a hole in it where th ecable tie has pinched the hose, with a bad gasket at the cap could let the fluid run down the hose to between the radiator and oil cooler.
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Old 11-19-2012, 02:32 PM   #7
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Quote:
Originally Posted by bgpowe View Post
It is radiator fluid, for sure. Just odd that it only seems to happen after the bike is parked for a few days. In between tat time nothing.


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Weird.id try wrapping newspaper round various components when you park it up and see which bit gets damp.
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Old 11-19-2012, 11:48 PM   #8
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Quote:
Originally Posted by bgpowe View Post
My '05 CVO, is acting very weird with regards to radiator fluid leaks. I ride my bike, no leaks. Park my bike one night, two nights, with no leaks. Any longer than that, and over night, I get up and have a small puddle. Anyone ever ave this happen?


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I had the exact same issue, very recently with my 2006 R. A very long story short- I just ordered a new radiator and boom the problem was fixed!
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Old 11-20-2012, 08:33 PM   #9
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Quote:
Originally Posted by Rich Moran View Post
Where does the over flow hose from the over flow tank end at?

If you can elevate that, see if the leak stops.

If the leak stops, you may have a bad gasket on the radiator cap.

When heated it works the way it is supposed to, when cool, the gasket looses it's ability to allow a tight seal, allowing overflow to occur.

Then the overflow hose (located at the center of the radiator and is cable tied in 2 locations on my 02) has a hole in it where th ecable tie has pinched the hose, with a bad gasket at the cap could let the fluid run down the hose to between the radiator and oil cooler.
That sounds reasonable. How do I verify this?


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Old 11-21-2012, 06:41 PM   #10
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Buy a new radiator cap at your local auto parts store. Only a few bucks. There is a thread somewhere on this forum detailing which brands will fit.
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Old 11-22-2012, 07:54 AM   #11
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That sounds reasonable. How do I verify this?


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The way the cooling system works is like this. It's completely full and cold mark on the overflow bottle will show this when cold. As the engine heats up expansion and pressure develop. Once the pressure exceeds the caps rating, the extra pressure forces coolant into the overflow bottle. This raises the level above the cold mark. As the engine and coolant cool it creates a slight vacuum. There is a secondary valve inside the cap that opens and allows fluid to be sucked from the overflow back into the system. Once cool the level in the bottle will again be at the cold mark. Say for example the coolant has cooled at 60* overnight and then the ambient temp climbs to 75*. There will be a slight possitive pressure within the system. Coupled with slighly loose cold connections for whatever reason this slight pressure is enough to show a small leak. Once hot components expand , likely sealing the leak point and no visible leak is noticed.
The easiest way to find this type of leak is to pressurize a cold system with the standard rad test equipment.
Testing both valves of the cap to varify function is a good check to do as well.
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