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I had the exact same issue with my '92 Civic when I bought it. Air barely trickled out of the vents.
The evaporator was covered with a "carpet" of dust and crud.
On many cars, removing the evaporator is a big pain, but we're lucky.
If there is any freon in it, take it to a shop to have it sucked out. After that, it's just a matter of unbolting the evap lines on the firewall side. Then remove the glovebox. There is a plastic cover over the evaporator, remove that. Then just wiggle and pull on the evaporator to free it.
I used compressed air and a plastic brush to clean mine. Made a huge difference. Most modern cars have cabin air filters that prevent this from happening.
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