No airflow traced to blower blockage, not fan motor

What we found

No-airflow cases can be motor faults or severe buildup. We checked the air path and blower condition to narrow it down.

• Running sound was present, but air output was very low
• Airflow pattern matched restriction more than a dead motor
• Heavy buildup was found on the blower wheel

The blower wheel had heavy buildup. It could not move air properly. The unit sounded active, but air movement was blocked. This made the symptom look like a motor fault when the main problem was the air path.

What we did

The motor is fine. The blower wheel is heavily loaded with buildup that is blocking air movement. Clearing the buildup restores output without replacing any parts. We retest airflow and cooling after cleaning to confirm it is back to normal.

After the airflow path was cleaned and restored, air output returned and cooling improved. The motor was fine — the airflow path was the issue.

What we learned

How to tell a blocked blower wheel from a dead motor.

• A dead motor is usually sudden — the unit runs silently or makes a straining sound. When the unit still sounds active but almost no air comes out, the air path is the more likely culprit.
• Heavy buildup on the blower wheel reduces how much air it can move, even when the motor is spinning at full speed. The output can drop to near zero without the motor failing.
• Checking the blower wheel and air path before any motor replacement decision is the correct order — it changes the repair scope significantly when buildup is the real cause.