Musty Smell from AC in 2020 Jeep Grand Cherokee
A musty odor when the AC is running typically indicates mold, mildew, or bacterial growth in the evaporator case or cabin air filter. This is common in humid climates and is not an immediate safety risk but can affect comfort and air quality.
Diagnosis Details
Possible Causes
Clogged or dirty cabin air filter allowing moisture and debris to accumulate
Mold or mildew buildup on the evaporator core due to condensation not draining properly
Blocked evaporator drain tube causing water to pool and stagnate
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What You Should Do
Replace the cabin air filter first.
If the smell persists, have the evaporator case cleaned with an antimicrobial foam or spray.
Check and clear the evaporator drain tube if water is pooling under the vehicle.
Run the fan on high with heat for 10 minutes after using AC to dry the system.
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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.
