Toyota RAV4 2020 AC Not Cold with Musty Smell
The AC system is blowing warm air and emitting a musty odor when turned on. This typically indicates a refrigerant leak or low refrigerant charge combined with microbial growth in the evaporator case.
Diagnosis Details
Possible Causes
Low refrigerant charge due to a slow leak (e.g., at compressor seals, condenser, or lines). This reduces cooling performance and can allow moisture to enter, promoting mold growth.
Clogged or dirty cabin air filter restricting airflow and trapping moisture, leading to musty smell and reduced cooling.
Faulty AC compressor or expansion valve causing insufficient refrigerant circulation and cooling.
Related OBD-II Codes
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What You Should Do
Inspect and replace cabin air filter if dirty.
Have the AC system pressure tested for leaks, evacuate and recharge refrigerant to correct level.
Clean the evaporator coil and case with an antimicrobial foam cleaner to eliminate musty odor.
If leak is found, repair or replace the leaking component.
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.
