Easy step by step guide one how to troubleshoot and repair vent low air flow,
this article pertains to most vehicles.
Difficulty Scale: 3 of 10
Step 1 - Most air control vents are equipped with
a flow control door that is located at the vent outlet. This door is controlled
by a thumb wheel that when activated will open and close the vent air flow door.
Work the thumb wheel from one side to the other while checking the airflow. The
flow should stop and start again, if the thumb wheel does not make a difference
the problem is somewhere else.
Step 2 - Most cars are equipped with a cabin air
filter or hepa filter. These filters are designed to clean the air before it exits
the air vent. If this filter becomes clogged due to lack maintenance it will stop
or slow the flow of air exiting the vents. To check this filter locate the filter
housing which can be either under the dash on the passenger side or under the hood
of the car, near the base of the windshield on the passenger side,
the cabin air filter and inspect.