Sweet Smell from AC in 2020 Toyota Camry
A sweet smell when the AC is on typically indicates a coolant leak from the heater core or a related component. The sweet odor is characteristic of ethylene glycol, the main ingredient in engine coolant. This can lead to overheating and interior damage if not addressed.
Diagnosis Details
Possible Causes
Leaking heater core – coolant escapes into the cabin through the HVAC system, producing a sweet smell when the AC or heat is on.
Coolant leak from hoses or connections near the firewall – coolant can seep into the ventilation system.
Evaporator core leak (less common) – though typically associated with refrigerant, a sweet smell is more specific to coolant.
Related OBD-II Codes
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What You Should Do
Check coolant level and inspect for visible leaks under the dashboard or near the heater core.
Have a professional mechanic perform a pressure test on the cooling system and inspect the heater core.
If the heater core is leaking, it will need replacement.
Avoid using the AC or heater until repaired to prevent coolant exposure and potential engine overheating.
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.
