Damp evaporator core breeds mold; dirty sock smell on AC startup.
Reviewed by SubaruReview Editorial Team · Last reviewed 2026-05-15 · Editorial standards
This is one of several documented Outback problems we track, and it fits inside the broader Reliability & Common Problems guide. If you're weighing repair against replacement, cross-check the Subaru repair-cost database and any open NHTSA recalls on your VIN before booking a shop.
Damp evaporator core breeds mold; dirty sock smell on AC startup.
Drain tube blockage and infrequent cabin filter changes.
Drain tube blockage and infrequent cabin filter changes.
National average $25–$350.
Difficulty 1/5. Evaporator foam treatment + cabin filter replacement; Kool-It evap cleaner.
Musty smell when AC turns on; Allergic reactions; Foggy windows
Owners typically pay $25–$350 at an independent Subaru shop, parts and labor included. Our Subaru AC Compressor Replacement Cost guide breaks the job down by parts, labor hours, and where the money actually goes.
We rate it 1/5 on our DIY scale. Confident wrenchers can tackle it in a weekend using the permanent-fix steps above. Cross-reference the reliability & common problems hub for related jobs worth bundling while you're in there.
Dig into the Problems Database to plan your next maintenance sprint, or browse every model hub for buyer's guides, generation breakdowns, and known-issue lists.