Buick's brand-new Yinglang water tank is leaking. It should be a small water tank or a water tank, that is, the sealing ring of the warm water tank is broken, just in front of the accelerator pedal. Replacing the sealing ring again can solve the problem, or replace the heating box. It is recommended not to replace the original factory or install reinforcement. Check whether the water tank cover is fastened. Unscrew the oil cover to see if there are any traces of oil emulsification (punch or pin corrosion). If there is something wrong with the engine cylinder gasket, it is necessary to disassemble the engine and replace the cylinder gasket. It is also possible that the quality of the water tank itself is problematic.