AC Not Cold and Smells Bad in Traffic
The air conditioning works well on the highway but becomes warm and produces a bad smell in stop-and-go traffic. This suggests a refrigerant issue or a failing compressor, combined with potential mold or bacterial growth in the evaporator.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a small leak, causing reduced cooling at low RPM (traffic) but adequate cooling at higher RPM (highway).
Failing A/C compressor or clutch, which cannot maintain pressure at idle speeds.
Mold or bacterial growth in the evaporator core, causing the bad smell when the system is running.
Blocked or dirty cabin air filter, reducing airflow and contributing to odor.
Related OBD-II Codes
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What You Should Do
Have the A/C system inspected for refrigerant leaks and pressure tested.
Replace the cabin air filter if dirty.
Consider an evaporator cleaning service to eliminate odors.
If the compressor is faulty, it may need replacement.
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.
