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Does that pipe connect to the top of the thermostat housing or expansion tank? If it's the thermostat housing, your thermostat is stuck open or missing completely.
Edit, looking at that pic closely, the pipe is fitted below both radiator cap seals suggesting it's from the thermostat housing.
Change your thermostat, then do as suggested above.
Last edited by Parksy; 7th September 2013 at 09:57 AM.