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The HVAC matrix. In this picture, the air moves from right to left. The heater core is visible through the partially open temperature door. 
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Actuators now control door positions. No more cables.



Bad Air Flow

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"A strange smell Sir?" Hmmm  " Not enough fresh air?" "Could it be the CAN of BEANS and QUART of OIL and 5 pounds of leaves blocking the air flow?
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Years earlier, a leaking heater was replaced. Airflow was always deficient afterwards....  Could it be the huge gap and missing hardware?