Sweet Smell from AC in 2020 Jeep Wrangler
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-based antifreeze, which can enter the cabin through the HVAC system. This issue requires prompt attention to prevent engine overheating and potential interior damage.
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 – A small leak can allow coolant to drip onto hot engine parts or into the HVAC intake.
Faulty evaporator drain or clogged AC drain – While less common, a sweet smell could also be from mold or bacteria, but the sweet scent strongly points to coolant.
Related OBD-II Codes
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What You Should Do
Check coolant level and look for visible leaks under the dashboard (passenger side footwell) or around the heater core area.
Inspect hoses and connections near the firewall.
If coolant is low, top off with the correct type and monitor.
A pressure test of the cooling system can pinpoint the leak.
If the heater core is leaking, it will need replacement, which is a labor-intensive job.
Also check for any dampness or staining on the carpet.
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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.
