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2010 Toyota Corolla AC isn't running like it used to

The air conditioner in my 2010 Toyota Corolla is working but is not as cold as it used to be. What could the probem be? What do you suggest I do? Finances low. Thank you.

If finances are too low to take it to a qualified A/C specialist, then either deal with the weak A/C and/or use your windows. A/C systems are not DIY fixable, and messing around with them (like adding a can of autostore refrigerant) will make some shops not want to mess around with your system as they won’t know what you added to the system