Actually people here dont describe the problem statement... Throw is referred to blower. And cooling and cool air is something different it is not described that throw dropped... If u are saying throw drops it means its issue related to blower...
If you say chill factor or cooling drops that's another scenario... And in that case a car came to me from mirpur & it was low on 200g refrigerant due to leaky shradder valve... I replaced it & added new refrigerant. And the problem disappeared.