I cleaned the coils. Still blowing, but no cold air.
I used AC Flow Evaporator Coil Cleaner. It blows fine, the coils frost, but it is not blowing cold air. The coils are icing up in the air handler.
"To clean the coils, use an antimicrobial solution. When the solution turns the coils white, thoroughly rinse them with a garden hose. Follow the same procedure to clean the fan system (squirrel cage)"
I need to remove the squirrel cage. Is that difficult? Where would it be? I'm trying to find info on the DIY website.
If by chance I need Freon, how would I proceed with that-is that difficult to replace?
I would recommend you call a pro. It probably is low on freon and freon is not a DIY project as you need special tools, knowledge and usually a EPA license to buy it. At that age the compressor could be partially worn out and only a pro can tell you about it properly. If you try remove the fan and break it or cause a vibration you may regret it. An old worn unit will use LOTS of electricity $$ so you may want to have it assessed to find out its condition.