HVAC Problem Diagnosis · Phoenix Metro
Weak Airflow From AC Vents
Weak airflow can come from a clogged filter, blower problem, dirty coil, duct restriction, closed damper, or frozen evaporator coil. The repair depends on whether the airflow problem is system-wide or limited to certain rooms.
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Possible causes
- Dirty filter
- Failing blower motor
- Frozen or dirty evaporator coil
- Collapsed, leaking, or restricted ductwork
- Closed or blocked registers and dampers
Safe checks before calling
- Replace a dirty filter
- Make sure supply and return grilles are open and unobstructed
- Compare airflow between rooms
- If airflow suddenly drops and ice is visible, turn cooling off
The symptom is not always the failed part
Many HVAC failures create the same symptoms. A failed capacitor can look like a compressor problem. Low refrigerant can look like an airflow problem. A float switch can make a healthy system appear completely dead. Sapper HVAC starts with diagnosis so the repair is based on what actually failed.