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Cabin Filter Air Flow

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Old 07-25-10, 11:59 AM   #1
ayonnebay
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Default Cabin Filter Air Flow

I just replaced the cabin AC filter (2004 CL). The replacement filter had an arrow indicating "Air Flow". The plastic filter holder has an arrow indicating "Top". I installed the new filter so that it's arrow pointed in the same direction as the arrow on the holder, but now I'm thinking I did it wrong.

I think it's wrong because the old dirty filter I removed had all the dirt & debris on the Top. That would indicate that the air flows Downward through the filter, meaning the new filter air flow arrow should point Down - just the opposite of the arrow on the black plastic filter holder in the car.

Am i right ? - Should the Air Flow arrow on the new filter point down ?

Walt
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Last edited by ayonnebay; 07-25-10 at 12:32 PM..
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Old 07-25-10, 03:11 PM   #2
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I just checked and the arrows are indicating which sides should be "UP" not airflow direction. As long as you lined the two up and the arrow is going up, you're fine.
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Old 07-25-10, 05:16 PM   #3
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Originally Posted by AlexusAnja View Post
I just checked and the arrows are indicating which sides should be "UP" not airflow direction. As long as you lined the two up and the arrow is going up, you're fine.
Yeah, but not quite. The black plastic holder reads "TOP" with an arrow, but the new filter clearly reads "AIR FLOW" with an arrow (It's a WIX filter) - That's what makes it not seen right ......

I have a new OEM Toyota filter also, and that reads "UP" with an arrow, like you said, so installing the Toyota filter is pretty clear. I think in the case of a cabin filter it's not anything to be really concerned about, so I'm just going to leave the WIX filter as it is. Just for the record, though, it appears the actual air flow is DOWN - just the opposite of the (UP) arrows.

Thanks for looking at it. I appreciate that.

Walt
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Old 07-25-10, 05:55 PM   #4
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yea I agree it is confusing - the air flow onto the filter surface is certainly coming from the top onto the filter surface and then going down. So if the arrow on the filter is suggesting airflow orientation than the arrow on the filter itself should be facing downwards.
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Old 07-25-10, 07:22 PM   #5
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Agree, the flow is top to bottom. When I checked, the dirt was on the top. You did not mentioned you had none OEM...

The cabin filter I would not worry too much about performance. I only got OEM because the price difference was like $2 or so between what I could get OEM for and like a "Purolator" filter.

You should be fine.
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Old 03-20-14, 08:11 AM   #6
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Default Still Confused

I've had the same question for over a year, and thought after reading these posts I had the answer. However, let me add my two cents. Regarding my 2011 IS250, I mistakenly thought the air flow was up, coming from the engine compartment. I now agree with you guys that is is actually down. Here's the catch. I saved the original cabin air filter - the one that was factory installed. On the filter itself, it has the words "UP" clearly printed in two location. Right next to the two locations where the word "UP" is printed an up arrow also appears. Just to made make sure you guys understand what I'm saying, let me repeat - there is an arrow pointing up right next to the word "UP."
Doesn't this indicate that the the filter should have been installed with the up arrow pointing to the top of the filter, the direction from which the air is flowing?

I don't remember how the original filter was installed, but I can assure you, the dirty side of the original filter is on the side that would be considered the bottom, assuming the guys at the factory installed it with the arrow pointing up. So, now that we all agree the air flow is from inside the cabin and down through the top of the cabin filter, I'm assuming they installed the filter incorrectly at the factory. (The "UP" arrow is pointing to the clean side, and the other side of the filter, the one that I would imagine should have been on the bottom, is filthy.)
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Old 03-20-14, 04:28 PM   #7
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After all is said, what would happen if the filter was installed incorrectly? Would it not be doing it's job? The last time the reminder light came on for the cabin filter replacement, all I saw on the filter were a few pieces of twigs etc and the rest of the filter looked good. Should the filter be replaced regardless every 15,000 miles?
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Old 03-20-14, 05:18 PM   #8
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Quote:
Originally Posted by Bocatrip View Post
After all is said, what would happen if the filter was installed incorrectly? Would it not be doing it's job? The last time the reminder light came on for the cabin filter replacement, all I saw on the filter were a few pieces of twigs etc and the rest of the filter looked good. Should the filter be replaced regardless every 15,000 miles?
I think it should be changed yearly at least to prevent the dreaded mold smell. $25 to prevent that once year is a good investment in my opinion.
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Old 03-20-14, 05:18 PM
 
 
 
 
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