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Hi, I am an AA member and own a Toyota Corolla Sedan 2001 base model car. Recently when I turn on fan/AC, there is an abnormal noise raising from fan towards the left end of my car. I guess may be something is trapped inside the blower. How to resolve this. How much does it cost to fix this? My location is Dunedin

Without looking at it, it's anyone's guess. I presume yoy mean a noise is coming from one of the vents inside the cabin? Perhaps it's something as simple as a piece of paper jammed in the vent (which you may be able to remove yourself), However, if it's something deep down inside the heater box, it could be more involved.
If it's nothing you can see that's obvious, you'll need to take it to a mechanic for a listen, diagnosis and quote.