660 puking coolant

Okay guys need some advice. My 06 660 is puking coolant past the rad cap Into the overflow and out onto the firewall. The hot light was not on and the fan was running. Rad was decently clean. Only did it when engine temps were hot. I recently relocated my rad horizontally up on the frame rail And rode it quite a bit with no issues in fact I was happy that I did not get a plug Rad. Oil is clean no coolant there. There is not very much clearance between the rad and the hood. Is it possible that there wasn't enough air flow and the coolant boiled over in the rad. Could it be a week rad cap.

weak cap,head gasket,air lock,water pump,not enough air flow...

Could be boiling the coolant if the air flow is weak in its new position, that is my guess. Can you post a pic of where the radiator is mounted now? The rhino stock cooling system isn't the best in stock form, slight modification could cause an issue.

So I've kind of come to the conclusion that I do not have enough air flow where the rad is mounted up on the frame rail. Beings is it only overheated when it was very hot outside I have a feeling that I need to get some air up to that rad. I burped the system so no airlock anymore, But I think a hood scoop is the next add-on. Ordered one on eBay that will fit the front just fine. Won't be riding it in any hot weather till next year so will post pics and report on performance then.

You could also try adding some water wetter additive to the cooling system, I have had great results with that stuff in the past:

http://www.redlineoil.com/product.aspx?pid=74&pcid=10

Should be available at your local auto parts store

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Well, it had to be done. Not for looks, for functionality.

I now have the air flow required to keep er cool on those hot days. Fan only runs half as much now.

making that first plunge with the Rotozip was a little unnerving but had to be done nonetheless!