http://twitpic.com/czc5cn


It is the overflow to the coolant bottle, but seeks to me leaking a bit, sure it should connect to something.

Any help much appreciated.

 

Should connect to the top of the rad

 

no the overflow pipe connects lower down on the neck..................

that pipe off the cap is simply a breather and is normally just tucked down the front of the battery/vented into the inner wing

it shouldn't be leaking anything unless over filled or being pressurised by the expansion tank.............

 

if it's being pressurized, what could that be ?

 

It could be air in the coolant system or a blown head gasket.

Alternately it could be just a leaking cooling system pressure cap.