The co-pilot has water and the antifreeze is leaking. What happened?

Check the engine oil first. If there is antifreeze in the engine, the engine body and oil and water are sealed with plugs (usually problems will occur). If there is antifreeze in the engine body, check it by exclusion method. It appeared a month ago, and there is no problem now. The problem may be proved by the leakage of the water heating heater in the co-pilot position. Open it to see if there is any water leakage and rust in the heater (where the antifreeze in the engine passes for heating in winter) and the connecting pipe interface. This difficult action (no accessories after finding the problem) may require battery maintenance points.