A/C Not Cold with Musty Smell
The musty smell and lack of cold air from the A/C in your 2019 Hyundai Elantra typically indicate mold or mildew growth in the evaporator core, possibly combined with a low refrigerant charge or a failing compressor.
Diagnosis Details
Possible Causes
Mold/mildew buildup on the evaporator core due to moisture not draining properly, 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 A/C compressor or expansion valve causing inadequate cooling and potential moisture issues.
Related OBD-II Codes
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What You Should Do
First, replace the cabin air filter and use an A/C evaporator cleaner (foam spray) to eliminate mold.
If the smell persists or cooling is still poor, have a mechanic check refrigerant pressure, inspect for leaks, and clean the evaporator drain tube.
If the compressor is faulty, it may need replacement.
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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.
