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Sweet smell from the engine bay

Serious - act right away

sweet syrupy smell car · antifreeze smell

Symptom description

A distinct sweet, syrupy odor (often compared to maple syrup) coming from the engine bay or vents, usually meaning coolant.

Common causes

  • A coolant leak from a hose, radiator or water pump
  • A leaking heater core (if the smell is inside the cabin, especially with the heater on)
  • A blown head gasket allowing coolant to burn

What to check

Check the coolant reservoir level and look under the car for a colored (usually green, orange or pink) puddle.

Can you keep driving?

Not recommended for more than a very short distance. Low coolant leads quickly to overheating, which can cause serious engine damage.

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Descriptions are for guidance only and do not replace a workshop inspection. If you are ever unsure whether it is safe to keep driving, pull over in a safe spot.

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