Hi I have changed radiator, thermostat switch, external water tank but still my car is overheating after a long drive around 150 kms. When overheats water coming out (bubbling) from external tank & some times fans working & some times not working. Recently 3 months back I found water leak from near brake pedal when I used the Heater. Then I closed water connection completely to heater & I am not using heater. Since then there is no problem for 3 months. But again same problem started & no water leaking. Kindly help me to fix this please.