Hi can anyone give any advice?...i have a 03 streetka 1.6....coolant needs topping up every ten days... Can even tell when it needs it as engine makes rumbling sound... Warning light nor temperature light doesn't come on.till it's completey empty and signs of smoke. No visible leaks anywhere......

ther than this engine sounds and runs excellently for use and age. Recently changed alternator, coil, plugs, leads, oil

Hi, I found mine leaking from the coolant temp sensor on the thermostat housing,i just changed the whole unit as It came with new gasket/thermostat/sensor, issue sorted for me.

Try removing the airbox and look around the sensor ?

Hi, did you manage to find the leak at all ?

Have you tried the newspaper method under the car overnight to see roughly where the coolant is dripping from then trace it back up along the wet line ?