Sweet Smell from Engine or Cabin – Possible Coolant Leak
A sweet smell, especially while driving or after parking, is a classic sign of coolant (antifreeze) leaking. Coolant has a sweet odor and can leak from hoses, the radiator, water pump, or heater core. This can lead to engine overheating and serious damage if not addressed promptly.
Diagnosis Details
Possible Causes
Coolant leak from radiator, hoses, water pump, or heater core
Heater core leak (smell may be strongest inside cabin when heater is on)
Overflow reservoir leaking or cap not sealing properly
Related OBD-II Codes
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What You Should Do
Check coolant level in the reservoir and radiator (when engine is cold).
Look for puddles under the car, especially near the front.
Inspect hoses, radiator, and water pump for wet spots or residue.
If the smell is inside the car, the heater core may be leaking.
Do not drive if the coolant level is low or if the engine temperature rises.
Have the cooling system inspected by a professional as soon as possible.
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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.
