DIY Cabin Air Filter

[b_hickman11]

Originally Posted by PatrickJohnson

that is not accurate. The air is blowing upward from the blower, into the filter, and out the vents. I promise. I tested. Open your filter housing and turn on your AC. a quick hand over the blower motor while running (CAREFUL!) will confirm that the air hits the filter after the blower, and mere visual inspection will easily show the path of the air once it passes the filter.

I tried that the very first time and I also thought the air was blowing up. But after looking at all of the parts a little closer, it actually blows the other way.

You might want to check that again. Look under the dash while turning the knobs that selects re-circulate or fresh air. You will notice that this will move the plastic door that is right above the filter. When the door moves to the back, it closes off the outside air inlet and opens the re-circulate inlet. When the door moves to the front, this closes off the re-circulate inlet and opens up the fresh air inlet. If air was blowing up into the filter, the air would always blow into the car from underneath the dash or would blow cold air outside the car, and would never go out the 4 vents on top. You will notice that the vents are not connected to the system here. They are connected on the bottom side of the blower, not the top.