Most times when car AC airflow problems occur, you may think it’s a blower motor problem. It is true that this is one of the causes but there are several other things that can prevent airflow from the air-conditioning or heater. Prominent among this is clogged cabin air filter. This can prevent free flow of air.
It is possible that the air is blowing in the wrong place. For instance many cars have a default selection of air coming out of the defroster and hitting the windshield first. Most cars have three air direction flow namely; The feet being used for heat allows hot air rise and warm the whole cabin while the dash vents are for AC and the third area is defrost mode. It’s thus the duty of the driver to blend this different function. Two other doors to highlight are the recirculation door which prevents the outside air intake and takes air from the inside cabin. This is most times referred to as max AC since it’s the best way to have the coldest output. However it’s the temperature door that chooses if the air is sent through the ac evaporator or the heater core or a combination of the two. Use the climate control center to control this door. Now what happens if the blower motor is running and no air comes out of the dash vents? It could be a stuck or inoperative airflow control or blend doors
As your ages, it is bound to develop other AC issues. Most cable can develop issues like binding or kinking that reduce the strength of the opening and closing of the blend doors. Most times when happens, you feel a spring back on the temperature control as they try to operate it.
When you notice this, check and change the affected cable and component. On the other hand, AC airflow issues on vacuum operated systems usually starts from missing vacuum signals. No vacuum signal can cause the air to stop behind the dash and flow very weakly from the vents.
SEE ALSO:HOW TO DIAGNOSE AIR VENTS PROBLEMS