I see it now - thanks for your help !

Hi MountainManJoe - clear response thank you ! I'll try that for the hose, but there's a rigid line connected to it that seems to be in bad shape too. That could be the cause of the leak. It doesn't appear on the diagram you sent me. Do you know what it corresponds to?

Hello - I have a Chevy express 3500 4.8L V8 year 2009. I'm wondering what this hose is? One end is connected under the radiator cap and the other end seems to be connected just behind the water pump. Do you have any idea what it is? It's leaking at one extremity.