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Radiators & cooling · Updated · 1 minute read

Coolant Leak Under Car: How to Spot It and What to Do

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  1. 1
    Core Thin tubes and fins that shed the heat.
  2. 2
    Plastic end tank A crack along this seam is the usual failure.
  3. 3
    Radiator cap Never open it on a hot engine.
  4. 4
    Upper hose Brings hot coolant from the engine.
  5. 5
    Lower hose Sends cooled coolant back.
A modern radiator: an aluminum core with plastic end tanks.

Coolant leak under car? Look for a bright green, orange or pink puddle with a sweet smell. Get it checked soon, because low coolant can make the engine overheat.

Engine oil is brown to black, and red fluid is often transmission or power steering fluid. Clear water near the front passenger side is usually A/C drip, which is normal. Not sure? Leave cardboard under the car overnight.

The usual leak points:

  • Hoses and clamps: cracked rubber or loose connections
  • Radiator and cap: a hole from road debris, or a worn cap seal
  • Water pump: the seal around the pump shaft
  • Head gasket: coolant lost inside the engine

Don’t drive on low coolant. If the temperature gauge climbs, pull over and shut the engine off. A total loss of coolant can ruin the engine.

Never open the radiator cap or coolant tank on a hot engine. Hot coolant can burn you. It’s toxic to pets and children, so wipe up spills.

Have the system pressure tested to find the leak. For prices, read our guide to radiator replacement cost in Vancouver.

Service desk The full guide

Radiator replacement cost in Vancouver: the published prices, what a quote covers and how to compare quotes.

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