thank you for the comments, i explain it more in detail: I could not see where it came from when i looked at the engine from above, there is no visible leakage on the top, neither from the cap, it leaked somewhere under the engine, one drop every two or three seconds. I fully refilled the circuit and carefully drove to my mechanic's 5 km away and dropped the car there. By that time it was leaving a thin track of leakage on the road and still nothing visible from over the engine... It is certainly not a head gasket problem, what i dont know is if it is the hose, the O rings of the water pump, or some "metal" cracked: water pump seals or bearing (means water pump replacement) , radiator leakage (probably means radiator change), ... or even worse (block cracked means car replacement!)... Still HOPE it s the hose under radiator. Will see tomorrow. until then,,,, fingers crossed