Posts: 470
Joined: Fri Feb 08, 2013 2:44 pm
Leaf Number: 401511
Location: Buffalo Grove, Il

Cabin filter orientation - factory incorrect?

Fri Jun 26, 2015 6:23 am

I've noticed on both my Leafs that the airflow orientation marker on the cabin air filter points towards the engine.

However all the particles that are trapped in a dirty filter are coming from the engine side.

Am I missing something? In any case I reversed the orientation in my vehicles to match the actual air flow direction.
2018 Tesla Model 3 AWD - Delivery Nov
2016 SV; leased 20-Jan-17, 18k, 87% SOH; 4-July-18
2015 S; purchased 29-July-14, moved to AZ Nov-2014, 22k, 82% SOH; 01-Mar-18
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Posts: 2810
Joined: Thu Jan 20, 2011 9:40 am
Delivery Date: 17 May 2011
Leaf Number: 2026
Location: Chattanooga, TN

Re: Cabin filter orientation - factory incorrect?

Sat Jun 27, 2015 1:23 am

There is no engine.

Which way is it pointing :?:

Tim Lee
Chattanooga, TN

Man. Date: 03/10/11, VIN # 2026
Delivered 05-17-2011
Blue Ocean, 2011 SL-eTec

Posts: 655
Joined: Thu Jun 24, 2010 6:14 am
Delivery Date: 12 May 2011
Leaf Number: 592

Re: Cabin filter orientation - factory incorrect?

Sat Jun 27, 2015 7:26 am

I am guessing that the orientation of the filter doesn't really matter from the standpoint of effectiveness of filtration as both sides of it look to me about the same. That being said, it IS important that a used filter ALWAYS be replaced (if only inspected after removal) using the originally installed orientation so that the dirty side is never placed next to the cooling evaporator coils (which get cold and wet from condensed water and can easily get clogged from air borne dust, etc).

Looking at a recently dealer replaced filter (part# B7891-1FC0A -- FILTER ASSY-AIR), it is marked on the side with the tab:

"FRONT ^ A" (where ^ represents a solid arrow)

so it is somewhat ambiguous as to whether "A" means airflow or "FRONT" means front of the Leaf or front of the cooling coils.

I try to replace the filter myself (so that I can vacuum out that area which the dealership might not do), so I have interpreted the ^ as pointing towards the front of the Leaf (so that the pulling tab is on the top when installed). But my last Leaf inspection time I let the dealership replace it and I noticed later that the filter was replaced with the arrow pointing towards the rear of the car, i.e. towards the cooling coils which is, in fact, the direction of the airflow.

I might add that instructions seem to come with that filter, but they are in Japanese and the illustrations don't make the installed filter orientation clear.

Posts: 7
Joined: Wed Sep 14, 2011 8:44 am
Delivery Date: 03 Sep 2011
Leaf Number: 007354

Re: Cabin filter orientation - factory incorrect?

Wed Jul 25, 2018 8:23 pm

I know this is an old post, but I'm going to add my 2 cents. Just finished cleaning my coil with a feather duster and compressed air blower because the dealership did not seat the filter correctly, so it was not covering the radiator. I agree that the airflow is towards the rear of the vehicle. At this point I think the most important aspect is that you use a ruler to make sure the air filter reaches the end of the air box. It's easy for it to go up into the blower cavity instead of into the end of the airbox because of the angle and where the entrance to replace the filter is. Place ruler into cavity all the way to the end... then insert filter... then remove ruler. That prevents it from angling up into the blower cavity.

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