206 sport 1.4 2005. Enigne has started to overheat in traffic. leave it to cool down , STOP warning goes away and it's ok for a while. Blast the heater fans and it manages to get us home. Checked when it overheated again and the bottom hose is stone cold. Any tips on how to check what the fault is without having to 'plug it in'? I'm guessing thermostat, rad block or busted pump. Any ideas? Cheers.