1. If the heater of your car smells of alcohol, you should consider that the external circulation is on and the quality of glass water is not good.
2. If your warm air smells of antifreeze, consider that it still exists under the condition of internal circulation, indicating that your warm air water tank is leaking.
"The biggest smell of car heater in use may be that the air conditioning filter is too dirty. If the air-conditioning filter element is not replaced for a long time, a large number of foreign bodies such as dust left after filtration will adhere to the surface of the filter element. If these substances remaining in the air conditioning filter element contain special odor, it is recommended to check whether there is such abnormal leakage of antifreeze. "