HELP!!! VT coolant problem

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Hey guys, When my vt warms up then i turn it off this loud gurgling sound is made, and it is the coolant rushing into the overflow bottle, when i pinch the hose going to the overflow bottle the noise stops. So what would make the coolant start rushing to the overflow bottle?

It has never done this before, so i know its not normal. Could this be a faulty radiator cap?

[accentstencil]

I think a new cap will fix the problem.

[sxc_sound]

I think a new cap will fix the problem.

im hoping it is the problem lol. I searched around and the 2 things i found it could be are the radiator cap or blown head gasket, but i checked under trhe oil cap and theres no steam coming out the exhaust, but if it happened today, does under the oil cap get milky straight away...

[vt s]

radiator cap. On the cap there is a valve that opens that leads to your overflow and sounds like its not closing.

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thanks for the help guys, problem solved, it was a dodgy radiator cap!