My bull overheat yesterday afternoon after an hour of driving in freeway, weather is so hot and I have 4 passenger. It happen twice but on the second one we decided to cool it down totally (about 1 hour in gas station) at first 5-10 miles it has strike again over the normal temp (we thought it will overheat again) but it’s not, until we got home. My question is what should I do to prevent overheating again. i just drain and change the coolant last month. And I noticed the water coming out from the reservoir yesterday was light brown.