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Foam coming out A/C vents

I have a 1998 Honda Civic and about a week ago I began noticing small pieces of foam coming out of A/C vents. Any info on what the problem is and how to fix it would be greatly appreciated.

I have two ideas:

  1. The foam seals in the system are just getting old and need to be replaced.

  2. You have mice in there and they are tearing up foam for a nest.

If #2 you want to get them out real fast, they can cause some expensive damage.

If you don’t have critters in there, you can probably just ignore the problem. My 94 vehicle likes to do this once in a while if the A/C has been running for a couple hours. It has been doing this for several years with no other issues.

There are foam seals on the doors in the HVAC system. After 12 years they are drying out and falling apart. The pieces you see are not harmful, just an indicator of your Car’s age.

Replacing the seals is possible, but labor intensive and therefore expensive.