Hi guys. I just want to get other ideas and tips with regard to this problem. I have a 10 yr old carrier AC unit. Still performing best though it is a little bit old. But last week I noticed that the air coming out of this unit is a little bit warm. I changed the capacitor and still not resolve the issue. I also heard an ice cracking sound inside. What do you think is the problem? (I am just started learning AC tech from the last 6 months, so my knowledge is still limited and I am still in the process of learning). Hope to get a feedback. Thanks in advance.