This car does not have an air conditioning filter.
You can consider installing one yourself. It is not expensive, only a few dozen yuan. It is best to go to some reputable stores for installation. Warm air also uses the temperature of the water tank to provide heat, not air conditioning.
The Mazda 323 is a discontinued model. It was produced by Hainan Mazda in the past. It is a classic of that era and one of the "three new things". It has excellent maneuverability. Now you can only buy second-hand 323.