Intermittent Weak AC Airflow with Bad Odor
The AC system in your 2020 Silverado has intermittent weak airflow and a bad smell, likely due to a clogged cabin air filter, evaporator core issues, or a failing blower motor resistor.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter restricting airflow and causing musty odors
Mold or debris buildup on the evaporator core causing bad smell and reduced airflow
Failing blower motor resistor or blower motor causing intermittent fan speed issues
Refrigerant leak or low charge (less likely to cause weak airflow, but can affect cooling)
Related OBD-II Codes
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What You Should Do
Start by checking and replacing the cabin air filter.
If the smell persists, inspect the evaporator drain for clogs and consider cleaning the evaporator with a foam cleaner.
Test the blower motor and resistor for intermittent operation.
If airflow is still weak, have a technician check refrigerant levels and system pressures.
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.
