Dear sifus, In my previous topic, i mentioned that coolant signal comes on and I did a pressure test where only the nut was found to be the leakage. It was replaced. Now: 1) signal comes up from time to time; 2) Temperature shoots up fast when car is stopped at traffic light [Note: It goes down when i press the accelerator and start driving]. 3) checked the water level. Water is full [Note: one thing peculiar is ever since the coolant signal comes up, the water level has never dropped ie when i open the water cover, the water seems to be gassy and overflows. Very weird encounters.] PLEASE HELP. thank you.