Hello , I have a VW Passat 2003 4 Cyl , i love this forum and i want to share a problem in here , i have a water leaking problem in my car , i didn't send it to the agency because it's very expensive , but my mechanic unfortunately changed the water container , a metal pipe from the radiator to the motor and still i have the water leaking problem , i add like 1 litre of water to the water container every 3 days when i get the Check coolant manual message , no water leaking inside the car , any hints ?

Thanks !