Hello everyone, here goes for my first post.

I'm having some real trouble with my XT660R radiator whenever it's at idle or working real hard off road.

It seems like the fan isn't coming on when it should and the coolant is getting real hot and spitting out of the overflow pipe after 5-10 minutes idling. The fan does work but there doesn't seem to be consistency with when it comes on or not.

Also, during my investigations I ran the engine without the radiator cap off just to see what was happening in there and the fluid if pouring in to it from the pipe coming from the thermostat as soon as the engine starts...... I thought that this should only happen once the coolant reaches temp.

Any suggestions?