Car leaking fluid: identify it by colour
A puddle under the car can usually be identified by colour, smell and location.
AreaLeaks
UrgencyModerate
Can I keep driving? Drivable with care. Diagnose soon: performance, economy or other components can be affected.
Common causes
Clear, watery, no smell
Air conditioning condensate. Normal, under the front passenger area.
Brown to black, slippery
Engine oil. Under the engine.
Green, orange, pink or blue, sweet smell
Coolant. Under the radiator or engine. Toxic to animals.
Red or reddish-brown
Automatic transmission fluid or some power steering fluids.
Light yellow to brown, slippery, near a wheel
Brake fluid. Treat as urgent: do not drive.
Blue, thin
Windscreen washer fluid.
What to check
- Put a sheet of white cardboard under the car overnight to see the colour and location.
- Check all fluid levels.
- Brake fluid leaks need immediate attention.
- Clean the area and recheck to find the source.
Repair guides
General guidance only. A qualified technician can confirm the cause; brakes, steering and fuel leaks should be checked professionally if in doubt.