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Old 10-17-2012, 09:49 PM   #5
Focus Enthusiast
Join Date: Aug 2012
Fan#: 102548
Location: Austin, TX
What I Drive: 2012 White Titanium Hatchback

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Are you getting odor from your vents? The foam is more of a fungicide to kill bacteria and mold growing in the evaporator.
If you are not getting any odor then you do not need it.
I try to avoid running the A/C on recirculating air when I can. I think it helps keep it drier to run outside air thru.
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