Sweet Smell from AC in 2020 Nissan Rogue
A sweet smell when the AC is on typically indicates a coolant leak from the heater core or evaporator, as coolant has a sweet odor. This can also be caused by a clogged evaporator drain or mold growth, but the sweet smell strongly points to coolant. In a 2020 Nissan Rogue, this may be due to a faulty heater core or a leaking hose.
Diagnosis Details
Possible Causes
Leaking heater core (coolant leak into HVAC system)
Leaking evaporator drain or clogged drain causing moisture buildup with sweet-smelling mold
Coolant leak from a hose near the firewall or heater core inlet/outlet
Related OBD-II Codes
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What You Should Do
Check for coolant leaks under the dashboard (passenger side) and around the heater core area.
Inspect the evaporator drain for clogs.
If coolant is found, the heater core likely needs replacement.
If no coolant, clean the evaporator and drain.
Consult a mechanic for pressure testing the cooling system and HVAC diagnosis.
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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.
