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The most common issue with this symptom (if the AC is working) is a bad blend air door. The blend door is responsible for changing air flow directions based on the temperature you request. So, you could have the AC on, it could be working, but the door doesn't adjust to allow the cold air to enter, but rather allowing heat.
Here is a link that shows in general how one is replaced. I'm adding directions for replacement because then you can access it and determine if it is actually working.
https://www.2carpros.com/articles/replace-blend-door-motor
Specific directions are included in the two pics attached.
Let me know if this helps or if you have other questions.
Joe
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Wednesday, May 22nd, 2019 AT 7:34 PM