: Cabin Air Filter install....which direction is air flow to install filter correctly

03-13-2013, 09:43 AM
So cabin air filters require you to install the filter with the flow going with the directional arrow on the filter

there are no markings on the filter housing nor are there any responses on threads regarding installing the filter

so which direction should the filters arrow be placed in the holder......GM should have had this clearly marked as all my previous cars had an arrow showing airflow so you could line up the filter correctly

so i installed with arrow up...thinking the fan assembly is on the bottom....am i correct?

I purchased this filter from Amazon...other threads suggested another filter that is not available any more

ACDelco CF176 Cabin Air Filter it fits perfectly and was only 16.00 dollars



03-13-2013, 09:48 AM
The flow goes UP. I had the same question and I turned on the fan and stuck my hand in where the filter goes to figure it out.

03-13-2013, 02:17 PM
The flow goes UP. I had the same question and I turned on the fan and stuck my hand in where the filter goes to figure it out.

Every other thread on the air filter is filled with people stating to install the arrow pointing DOWN. This makes sense as the air is drawn in from the base of the windshield, through the filter and to the fan.




03-13-2013, 09:13 PM
i read some of those articles and one guy said after three months he looked at the filter and it was clean......

does not seem right that it faces down with the flow going up..

maybe thats why its clean...put in the wrong direction....

03-13-2013, 09:16 PM
deleted my message double posted it

07-30-2015, 11:14 AM
Im 100% sure that the air flow is down. Turn the car on and put the fan on high then hold a piece of paper in the filter housing. It will get blown/sucked down.

07-30-2015, 11:36 AM
Correct, and its more obvious if you look inside, you can see the center of the blower cage fan on the bottom, which sucks in the air.

07-30-2015, 12:01 PM
How does it make a difference? Is it a one-way air filter?

I seem to recall mine has some carbon particles on, for absorption presumably. Is that one-sided?

El Dobro
07-30-2015, 02:45 PM
If you spray some Lysol into the space for the cabin filter while the fan is running, you'll see it sucked down.

08-07-2015, 05:27 AM
In mine original is arrow down
I have seen a video with a arrow down too

08-09-2015, 01:37 PM
I have a new 2015 volt, the air flow is down, so the filter's arrow should be pointed downwards.

Mister Dave
08-09-2015, 01:54 PM


08-09-2015, 05:17 PM
The airflow is downward. My Filters always collect dirt on the TOP surface of the filter which proves that the airflow is downward.