Ac Blows Cold But Air Flow Is Not Consistent Car AC Low Air Flow Problems – Cabin Filter Or Expansion Valve?

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Car AC Low Air Flow Problems – Cabin Filter Or Expansion Valve?

Low airflow problems can be caused by a dirty cabin air filter, leaves in the evaporator case, or the evaporator getting too cold and snowing up. Not all cars have cabin air filters for passenger compartments. Many drivers don’t know that their car may even have a cabin filter, which is why it can go years without changing it. If experiencing low airflow through the dash vents; The cabin air filter, if equipped, should be checked. It is not uncommon for auto technicians to not even know if a particular model is equipped with a cabin air filter. That’s why if you have poor airflow, it’s worth mentioning to an auto technician the possibility of an air filter problem.

Oak trees

If the car is regularly parked under a tree (especially since oak leaves are small) there is a good chance that the leaves will find their way into the car’s AC duct-work. It is a good idea to keep the leaves clear of the mulch area. The cowl area is located under the windshield near the windshield wiper. Leaves tend to settle easily in this area. One of the problems is that the air-conditioned fresh air inlet is located in that area. Many times the leaves move into the air conditioning ventilation system through the fresh air duct work.

Evaporator core icing?

If the car AC runs very cold for a short period of time and then starts running warm and experiencing low airflow, the evaporator core may be sticking up. Sometimes the evaporator is too cold if the expansion valve is not working properly. This causes condensation on the evaporator to restrict airflow through the evaporator fins. The expansion valve is designed to keep the evaporator cool but above freezing point. If this is happening, an indication is that the air conditioning can be turned off for a few minutes (time to melt the snow) and then when it is turned back on it will run again for a few minutes until it snows again. Another reason for evaporator ice buildup can be moisture in the system. If moisture is a problem, the A/C drier may need to be replaced and then the system can be drained and recharged with a vacuum pump. The drying agent in the dryer will remove the moisture from the AC refrigerant along with the evacuation process.

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