AC Not Cold and Bad Smell – Nissan Rogue 2020
The AC works well at highway speeds but blows warm air in traffic, accompanied by a bad smell. This suggests a refrigerant issue (possibly low charge) or a failing compressor, with the smell indicating mold or bacterial growth in the evaporator.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a slow leak, causing reduced cooling at low RPM (traffic) but adequate cooling at higher RPM (highway).
Failing A/C compressor clutch or compressor internal leak, leading to intermittent cooling.
Clogged or dirty cabin air filter causing bad smell and reduced airflow, especially in stop-and-go traffic.
Mold or mildew growth in the evaporator core, producing a musty or sour smell when the AC is running.
Faulty expansion valve or orifice tube restricting refrigerant flow at low engine speeds.
Related OBD-II Codes
Not satisfied with this diagnosis?
Try Another DiagnosisWhat To Do Next
What You Should Do
Check refrigerant pressure with a manifold gauge set.
If low, inspect for leaks (dye test) and recharge.
Replace cabin air filter if dirty.
Use an evaporator cleaner or run the AC with the recirculation off to dry the evaporator.
If compressor clutch doesn't engage, test clutch coil and relay.
Share this diagnosis
Help others with similar symptoms
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.
