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Coolant Leak

Green, pink, orange or blue drips with a sweet smell are coolant. A leak can lead to overheating if the level drops too far.

High risk

Have it checked promptly. Watch the temperature gauge and do not drive if it climbs.

Short answer · Is it safe to drive with a coolant leak?

Only for short distances while watching the temperature, and only if the level is above the minimum. Coolant loss can quickly lead to overheating and engine damage. Check the level when cold, top up with the right coolant and have the leak repaired soon.

On this page

Safe checks you can do

  1. Check the level when coldLook at the expansion tank markings.Never open the cap on a hot engine.
  2. Find the drip positionUnder the radiator, water pump or along hoses.
  3. Watch the temperature gaugeIf it rises above normal, stop and switch off.

Questions that narrow it down

  1. Is the drip coloured and sweet-smelling?Confirms coolant.
  2. Does the heater blow cold?Low coolant can affect the heater.
  3. Is there white exhaust smoke?Can mean an internal leak.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Hose or clampAgeing rubber and loose clamps.
  2. RadiatorCorrosion or damage.
  3. Water pumpLeaks from the seal.
  4. Expansion tank or capCracks or a weak cap seal.
  5. Head gasketInternal leak, often with white smoke.

Questions about Coolant Leak

Can I use water to top up?

In an emergency, yes. Have the mixture corrected later to keep frost and corrosion protection.

Is clear water under the car coolant?

Clear water under the front passenger area is usually condensation from the air conditioning, which is normal.