Hi i currently been having a problem with my car's cooling system. The car is regularly overheating and the STOP warning light starts flashing. Although the water resivoir didn't always need topping up whenever I twisted the cap off and pressure was released the water would begin to rise and overflow so then more water was then needed. I was under the impression that the temp of the new water was kicking in the thermostat and allowing the temp to drop. Maybe I was wrong. I was informed by somebody that the relay switch could need replacing. So I got a new one and replaced it. (The black relay) it seemed to work a lot better for about a week before it began happening again and upon inspection I noticed that the 30a fuse located by the fan had blown so replaced that but then I noticed that there was a wire corroded away from somewhere and it appeared to be going to the other relay (the green one) so I stripped it back and refitted it into the socket, cleaned off the green relays terminals and pushed it back in. The problem is still occuring and I'm not sure what I'm missing could somebody please help