What Causes the Passenger Side Air Vent to Stop Blowing Air?

[DeCourtney]

Here are the specific reasons why the passenger side air vent may not be blowing air: 1. Clogged Cabin Air Filter: The outside air passes through the cabin air filter before entering the vehicle interior. The primary function of the cabin air filter is to isolate dust, particles, moisture, and other contaminants from the air while also providing strong antibacterial and deodorizing effects. 2. Blower Motor Failure: When using the air conditioning system normally with the fan speed set high, you can hear a sound coming from under the passenger seat - this is the blower motor operating. The higher the airflow demand, the faster the blower motor needs to draw in air. If the blower motor is damaged, it may result in insufficient air intake or complete failure to draw air, preventing airflow from being delivered through the vents.