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What freon is used on an 01 Lexus IS 300?

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I just got this car not that long ago, my AC was super cold until about a week ago. Only hot air comes out now. I was told to buy freon but I'm not sure what to buy.. any suggestions ? 

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Fixing this is probably involves more than just adding refrigerant.  It's likely that a component has failed causing a leak.  If you have to ask what refrigerant to use, I suspect that you do not have the special tools and knowledge required to diagnose and repair A/C systems.

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