Air conditioner not blowing air or blowing out warm air can be due to several reasons. The most popular reasons according to the level of severity are as follows -
Frozen Coils
Inadequate refrigerant levels, dirty refrigerant or cracked coils can result in the water in the air condensing. This forms water droplets on the coil and blocks airflow.
Broken Fan
The motor fan inside the air conditioner is responsible for maintaining the airflow. However, without a fully functioning fan, the air conditioner cannot provide a room with cold air.
Dirty Coils and Filters
Dirty coils and filters make it difficult for the cooled air to move into the room. This blocked airflow will overwhelm and heat the unit.