I have a Trane TUE120A960H1 that is probably about 18 years old. The blower motor first started being really loud when running and had low air flow and after about a week, would not come run at all. There was a buzzing sound and I could prod the hamster wheel by hand to get it started but it was still loud and not spinning well. Based on the history below, I thought it best to replace the motor and cap with a new one. Low and behold, when I put in the new one, it did the exact same thing. It will hum but not start and if I prod it by hand, it will run but slowly and loudly. Sounds exactly like the old one. I can't find anywhere that it might be rubbing the housing and it spins relatively well by hand (although the old one spun easier). I am now at a loss (or I guess I always was). Anyone have any idea what else could cause such and issue? History: I moved into the house early last year. At one point, not long after moving in, I noticed that the system was really loud and upon investigating found that the motor was loose from the housing and rubbing against it. I put one screw back in but apparently they were all bad. I also had what seemed to be low airflow and the evaporator was freezing up. When the noise soon returned, I replaced the motor mount completely which seemed to be fine through the winter although I still had low airflow and freezing up. A couple of months ago, I noticed that it was loud again but a different loud. It still seemed to be mounted properly with plenty of clearance. That is where I am today.

I have a 3 ton (?) Carrier that is 13 years old. Recently we noticed the air was not very cool. Had a guy come out and said it was low on Freon due to leak test which was from the evaporator. He put 6 lbs of Freon in to the tune of $450 and said it might have taken 8 but only did 6 to keep the cost down for me as he knew I didn't want to spend a lot. He said Freon should last a life time so a leak is the only way it will ever run out. Is it worth replacing the evaporator or should I just replace the whole unit? I am supposing that I have the old refrigerant R410(?) and would get the new R22(?) for a new one?