AC Not Cold and Bad Smell in Traffic
The AC works well on the highway but loses cooling in traffic, accompanied by a bad smell. This suggests a refrigerant issue or a failing component that struggles at low airflow.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a slow leak, causing reduced cooling at idle/low RPM
Faulty cooling fan or fan clutch not engaging at low speeds, reducing condenser airflow
Clogged or dirty cabin air filter causing bad smell and reduced airflow
Mold or mildew in the evaporator core producing musty odor
Related OBD-II Codes
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What You Should Do
Check refrigerant pressure with a gauge set; inspect cooling fan operation at idle; replace cabin air filter if dirty; consider an evaporator cleaning service if smell persists.
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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.
