Motoro
Sign Up
← All Symptoms

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.

Ask AI for more specific detail

Describe your situation more precisely (e.g. exactly when it gets worse, how long it lasts) and get an expanded, personalized breakdown.

Don't guess what's wrong with your car

Find a trusted auto repair shop near you and book a diagnostic visit online in minutes.

Find a repair shop

Run a shop? The OBD decoder, fuse box diagrams and parts catalog are built into the Motoro dashboard. See Motoro for workshops

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.

Related symptoms

Free on iOS and Android

Diagnose your car with Motoro AI

Get the app, plug in an OBD2 adapter and ask Motoro AI what this code means. It checks your car live and tells you what to do next.

Motoro AIAppointment booking
Get the app