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Car smells of burning: what to check

Work out from the smell whether to stop now or book the garage, and what to tell the mechanic.

19 items · 4 sections · car, mechanic, driver, safety

Start this checklist

Right now (5)

  • Smoke or flames: pull over, engine off, everyone outMove well away from the car and away from traffic, then call the emergency number.
  • Do not open the bonnet if you see smoke or flamesFresh air can feed a fire.
  • No smoke: stop somewhere safe and turn on the hazards
  • Check the temperature gauge and the warning lightsA red light or a gauge in the red means do not drive on.
  • Let the engine cool for at least 30 minutes before you touch anything

Match the smell (7)

  • Burning plastic or electrical: treat it as urgentCould be a wire or a melted part. Do not drive until it has been checked.
  • Burning rubber: look for a slipping belt or a loose hose touching the engine
  • Burning oil: look for oil on the engine or the exhaustOften a small leak dripping on hot metal. Check the dipstick.
  • Sharp, acrid smell near a wheel: suspect the brakesA stuck brake or a handbrake left on can do this. Do not touch the wheel: it can burn you. Get a garage to look.
  • Sweet, syrupy smell: suspect a coolant leakNever open the radiator cap while it is hot.
  • Burnt smell after a steep hill or a hill start: suspect the clutchShould fade once it cools. If it keeps coming back, have the clutch checked.
  • Rotten eggs or fuel smell: do not keep drivingFuel can catch fire. Have it towed if you smell raw fuel.

Quick look once cool (4)

  • Look under the car for fresh drips and note the colourBrown or black: oil. Green, pink or orange: coolant.
  • Look for a plastic bag or debris stuck on the exhaustCommon and easy to fix once it is cool.
  • Check the oil and coolant levels
  • Check the handbrake is fully off

Garage (3)

  • Write down the smell, when it starts and how long it lasts
  • Note whether it comes through the vents or from outside
  • Call for a tow if the smell is electrical or fuel, or if it comes back

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