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Engine overheating on the highway

Temperature needle in the red or steam from the bonnet: stop safely, let it cool, then decide whether to drive or call for a tow.

17 items · 5 sections · car, mechanic, driver, safety

Start this checklist

While still moving (3)

  • Turn the air conditioning off
  • Turn the heater and fan to fullIt pulls heat away from the engine. Open the windows if the cabin gets hot.
  • Put your hazard lights on and head for the next safe place to stop

Stop safely (4)

  • Pull onto the shoulder or an exit, well clear of trafficDo not stop in a live lane unless the car has already died.
  • Switch the engine off
  • On a fast road, get everyone out on the side away from trafficStand behind the barrier if there is one.
  • Do not open the bonnet if smoke or flames are coming outMove away and call your emergency number: 911 US, 999 UK, 112 India and EU.

Let it cool (3)

  • Wait at least 30 minutes before touching anythingPressurised coolant can scald you.
  • Never open the radiator cap while the engine is hot
  • Do not pour cold water on a hot engine

Check once it is cool (4)

  • Look at the coolant tank: is the level below MIN?
  • Look under the car for a green, pink or orange puddle
  • Look for a split hose or a loose or broken belt
  • Top up to MAX with coolant, or plain water to get you movingTell the garage if you used water: it needs the right mix afterwards.

Decide (3)

  • Call for a tow if coolant is pouring out, a belt is broken or the oil warning light is onDriving on can wreck the engine.
  • Otherwise drive gently to the nearest garage and watch the needleIf it climbs again, stop and wait again.
  • Get the cause fixed before your next long drive

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