If you are driving at normal speed and the vehicle starts to overheat, turn off the air conditioner and take the vehicle to the side of the road. There might be a problem in the cooling system such as low coolant, a clogged radiator or a burst hose pipe. In this case open the bonnet and let the engine cool for around 20-30 minutes. When the engine is cooled check if the coolant is less/over. If there is no coolant than you can add a coolant-water mixture to the radiator, also check the hose pipe before you add coolant. If this heating problem comes again than get your vehicle checked by a technician.