My air condition was working fine very strong and cold until the blower motor dead 6 month ago.. this cause the whole system to shut down

but from time to time when the motor blower do kick on the aircondition is very col..

Last week I fix the blower motor problem it was nothing but the relay next to the resistor pack was bad connection...

now the blower is working fine . heater to..

But the main problem now when I but on aircondition mode no more cold air come out just plain..

1. What should I check for ?
2. How can tell if my Freon is low or not ?
3. is there some switch that not kicking the aircondition to ON ?

4. Is there some lose connection in the engine or under dash board that I should be checking ??

Hard to think the freon is low few back it kick on and every thing was very cold working fine...

but than I can be wrong

Thanks for all your input and support.....