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Airflow only when recirculation button engaged

Heating and Ventilation

Model: C4S, Year:1996, Mileage:40000, Type of use:Street use only
I only get airflow from the HVAC system when the recirculation button is engaged. If not engaged the fan still blows but there is no airflow. Adjusting the sliders makes no impact on this. This is present with both heat and A/C. Has anybody heard of this and what have they done to resolve.

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