Sweet Smell from AC in Ford Explorer 2020
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 avoid overheating and potential engine 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 heater is on.
Leaking heater hose or connection: A coolant leak from a hose or fitting near the firewall can allow coolant to enter the cabin air intake.
Coolant reservoir or radiator cap issue: A faulty cap or overflow tank can cause coolant to spill and be drawn into the AC system.
Related OBD-II Codes
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What You Should Do
Inspect the passenger side floor for coolant stains or wetness.
Check coolant level and look for visible leaks under the hood, especially near the heater hoses and firewall.
If a heater core leak is confirmed, the core must be replaced, which is a labor-intensive job.
Have a professional mechanic perform a pressure test and dye test to locate the exact source.
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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.
