Intermittent Weak A/C Airflow with Bad Odor
The A/C system in your 2020 Toyota RAV4 is producing weak airflow that comes and goes, along with a bad smell. This combination often points to a dirty or clogged cabin air filter, a failing blower motor resistor, or mold/bacteria buildup in the evaporator case. The intermittent nature suggests an electrical or airflow restriction issue rather than a refrigerant leak.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter restricting airflow and causing musty odor
Failing blower motor resistor causing intermittent fan speed control
Mold or bacterial growth in the evaporator case producing bad smell and partial blockage
Blower motor motor brushes wearing out or debris in the fan cage
Related OBD-II Codes
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What You Should Do
Start by replacing the cabin air filter (located behind the glove box).
If the smell persists, use an A/C evaporator cleaner spray to kill mold.
If airflow is still weak or intermittent, have the blower motor resistor and blower motor tested by a mechanic.
Check for any debris blocking the fresh air intake under the cowl.
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.
