问：我的车很热

我的车过热。没有泄漏。进行了压力测试。没有水与油混合。更换了恒温器，水泵，散热器软管。服务引擎灯不在。在一个小时内到达了3个冷却液容器。可以将加仑一加仑的水倒入水箱中，而它的眨眼就不断消失。没有泄漏。那么水和冷却液在哪里？ took car to mechanic shop. they did not see anything wrong and do not know why it's running hot. when open the radiator cap water pours out of the over flow. bled the car for air.there was a lot of air that came out but then the water started pouring out consistently. car can run for hours in park without getting hot. but gets hot while in driving on the road. it gets all the way to the red. what can be making the car run hot? where is all the water and coolant going? and how come mechanics cannot find anything?