A musty, moldy, or dirty-sock smell comes from the vents when you turn on the AC. This is usually mold and bacteria growing on the evaporator or cabin filter.
Find a ProviderMoisture sits on the evaporator between drives; when air first blows through it, the trapped mold smell hits hardest.
Usually a new cabin filter plus an evaporator cleaning/treatment, and clearing the AC drain so water doesn't pool.
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