AC Not Cold with Musty Smell
The musty smell and lack of cold air from the AC in your 2019 Toyota Corolla typically indicate mold or mildew growth in the evaporator core, possibly combined with a refrigerant leak or low refrigerant level.
Diagnosis Details
Possible Causes
Mold or mildew buildup on the evaporator core due to moisture accumulation, causing the musty odor and reduced cooling efficiency.
Low refrigerant level from a slow leak, reducing cooling capacity and allowing moisture to accumulate.
Clogged cabin air filter restricting airflow and trapping moisture, leading to odor and poor cooling.
Faulty AC compressor or expansion valve causing inadequate cooling and moisture issues.
Related OBD-II Codes
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What You Should Do
Replace the cabin air filter first.
If odor persists, have the evaporator coil cleaned and the AC system inspected for refrigerant leaks.
Use an AC disinfectant spray or ozone treatment for the musty smell.
Check refrigerant pressure and recharge if low.
Related Repairs
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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.
