Sweet Smell from AC in 2020 Jeep Grand Cherokee
A sweet smell coming from the air conditioning system typically indicates a coolant leak from the heater core or a related component. The sweet odor is characteristic of ethylene glycol-based antifreeze, which can enter the cabin through the HVAC system when the heater core is leaking.
Diagnosis Details
Possible Causes
Leaking heater core – Coolant leaks from the heater core into the HVAC case, producing a sweet smell when the AC or heat is on.
Coolant leak from hoses or connections near the firewall – Leaking coolant can evaporate and enter the cabin air intake.
Clogged or faulty evaporator drain – Condensation buildup can mix with coolant residue, but less common as primary cause.
Related OBD-II Codes
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What You Should Do
Inspect the passenger side floorboard for coolant puddles or dampness.
Check coolant level and condition.
Have a professional pressure test the cooling system and inspect the heater core and hoses.
If the heater core is leaking, it will need replacement, which is a labor-intensive job.
Do not ignore as coolant is toxic and can damage HVAC components.
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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.
