It is recommended to do waterway inspection, you can also directly make a spray pipe against the water tank, which will reduce the water temperature a lot. Car air conditioning open water temperature rise is normal, there is generally this phenomenon, open air conditioning after the water temperature is about ten degrees more than before, there is more diesel than usual, and the head power becomes smaller (in the slope when the larger obvious, finally turn off the air conditioning before the slope, and then open downhill). There are several reasons why the water temperature is too high: first, the water circulation is blocked, including: the scale of the pipeline tank is blocked, which mostly occurs in the car that replaces the antifreeze with tap water in summer; The thermostat is faulty, and the water temperature cannot be opened normally after a small cycle, resulting in a large cycle. Second, the cylinder head pad is washed out, and the heat in the cylinder directly enters the circulating water leading to high temperature. Third, the water tank or air intake has debris, poor ventilation, this reason generally does not lead to rapid high temperature.