AC Not Cold with Musty Smell
The musty smell and reduced cooling performance in your 2020 Tesla Model 3's AC system typically indicate mold or bacterial growth in the evaporator core, often combined with a low refrigerant charge or a clogged cabin air filter.
Diagnosis Details
Possible Causes
Mold or bacterial growth on the evaporator core due to moisture accumulation, causing the musty odor and reduced airflow.
Clogged or dirty cabin air filter restricting airflow and trapping moisture and contaminants.
Low refrigerant level (leak) reducing cooling efficiency, often accompanied by the smell as the system struggles.
Related OBD-II Codes
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What You Should Do
Replace the cabin air filter first (Tesla recommends every 2 years or 20,000 miles).
Use an AC evaporator cleaner foam to kill mold/bacteria.
If cooling remains poor, have a technician check refrigerant pressure and inspect for leaks.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
