I have a 2002 Ford Focus that I recently got last month and now it blows hot air when the setting is…

I have a 2002 Ford Focus that I recently got last month and now it blows hot air when the setting is low the air is cool but when I turn the AC on to the highest setting the air is so hot, how do I fix it ?

so many things can go wrong on Ac systems,a start by having the system checked for low refrigerant and pray that's all that's wrong

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