we have a 2015 honda civic 2D coupe. bought it at end of 2015, haven't been using the A/C much. But this summer when turned on the A/C, it didn't produce cool air anymore. Tried to refill the A/C with AC pro (didn't expect the refrigerant will be empty so quickly), it cannot be filled in. The pressure stays high.

 

Could be something to do with your engine coolant? Or maybe your radiator? How are they doing? Is it just blowing out warm air?

 

Over filling can cause it to not cool properly. Ideally you'd recover and weigh the refrigerant to see if it had enough. If it's low you have a leak that needs to be repaired before you add more.

You then would vacuum for a half hour or so to add the proper amount of refrigerant. Mixing air with refrigerant will cause it to not cool properly.