Salaam all, I'm facing a slight issue with my 95' Civic. It heats up, in summers or winters, but only on long route if driven fast, In the city, even in extreme heat with A/C on, car is perfectly fine; no issue at all. But once you take it out on a long route and starts to drive faster for a longer period of time, it starts to heat up. Someone told me to take out a valve or pipe that carries the heated water to the carborator (if I'm not wrong) but I would have to put it back in the winters. Can anyone please suggest me what could be the problem before I take it to the mechanic?