Symptom:
Low Airflow from Vents
Condition
Relatively less airflow from the HVAC vents than normal while the blower fan speed switch is in any active position.
Detection
The condition is most easily observed by placing a hand near one of the HVAC vents to feel for less air movement than normal.
Description
Airflow is produced by a blower motor located in the HVAC box. The motor is equipped with a two-wire connector for power and ground circuits. Both of these elements must be present for the motor to turn on. Depending on the system design, one of the two elements is removed to turn off the motor. Similarly, motor speed is controlled by placing a resistor or transistor into one of these two circuits.
Recommended Tests
Similar Symptoms
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