Sweet Smell from AC in Tesla Model 3
A sweet smell from the AC in a 2020 Tesla Model 3 typically indicates a coolant leak from the heater core or AC evaporator, or mold/bacteria growth in the evaporator case. The sweet odor is often coolant (ethylene glycol) or a sign of microbial contamination.
Diagnosis Details
Possible Causes
Coolant leak from heater core or AC evaporator – sweet smell is characteristic of ethylene glycol coolant.
Mold or bacteria growth in the evaporator case – produces a sweet, musty odor when AC is on.
Refrigerant leak – can sometimes produce a sweet or chemical smell.
Related OBD-II Codes
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What You Should Do
Check for coolant leaks under the dashboard or near the HVAC unit.
Inspect the cabin air filter for mold.
If coolant is leaking, repair the heater core or evaporator.
If mold is suspected, clean the evaporator case and replace the cabin air filter.
Use a UV dye test for coolant leaks.
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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.
