Sweet Smell from AC – Possible Coolant Leak
A sweet smell coming from the AC in a 2020 Subaru Outback typically indicates a coolant leak. The heater core or a hose may be leaking, allowing antifreeze to enter the cabin when the AC is on.
Diagnosis Details
Possible Causes
Leaking heater core – coolant leaks into the cabin through the HVAC system, producing a sweet odor.
Leaking heater hose or connection under the dashboard.
Leaking radiator or coolant reservoir (less likely to produce cabin smell unless vapor enters via recirculation).
Related OBD-II Codes
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What You Should Do
Check coolant level and inspect for visible leaks under the hood and inside the passenger footwell.
If you see a puddle of sweet-smelling liquid or notice low coolant, have the heater core and hoses inspected by a professional.
Do not ignore as coolant is toxic and can cause engine overheating.
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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.
