The air filter and the air conditioner filter are not replaced together:
1. Generally, the air filter element should be changed once when the oil is changed twice, and the air-conditioning filter element is recommended to be changed once every two years;
2. In fact, these two filter elements are very cheap! If the air filter element is not replaced, there will be a lot of dust and garbage, which will affect the operation of the engine. The maintenance of the engine is necessary just like a person;
3. If the air-conditioning filter element is not replaced, the bacteria will grow and drain through the pipes to the car interior, which is harmful to the human body. Therefore, it is necessary to replace it regularly. The air-conditioning pipes should also be cleaned regularly, and bacteria are also easy to breed.

The difference between air filter and air conditioning filter is:
1. The function is different. The air filter is a device to remove particles and impurities in the air;
2. Mainly used in the fields of pneumatic machinery, internal combustion engine, etc., the role is to provide clean air for these machinery and equipment, in case these machinery and equipment inhale air with impurity particles during work and increase the probability of abrasion and damage;
3. The air conditioning filter filters the impurities, tiny particles, pollen, bacteria, industrial waste gas and dust contained in the air entering the cabin from the outside, so as to improve the cleanliness of the air and prevent these substances from entering the air conditioning system and destroying the air conditioning. The system provides a good air environment for the occupants in the car, and also prevents the glass from fogging.