The symptoms of a broken expansion valve in the car air conditioner are: 1. The air conditioner has cool air but no air volume.
2. There will be frost or condensation at the inlet of the expansion valve.
3. There is no temperature difference between the inlet and outlet of the expansion valve.
The reasons why the expansion valve of the automobile air conditioner is broken are:
1. The opening of the expansion valve is too small or out of order.
2. The opening of the expansion valve is too large.
Precautions for the use of car air conditioners are:
1. Choose the right air conditioner temperature.
2. The internal circulation cannot be started immediately when entering the car in summer.
3. Use the air conditioner in a fully enclosed state.
4. The direction of the air outlet cannot be adjusted at will.
5. The air conditioner cannot be turned on for a long time.
6. Do not rest or sleep for a long time in an air-conditioned car.