So you've realized that fluid is leaking from your vehicle. Believe it or not, there's a simple way to find out where it's leaking from. You'll need a large piece of white cardboard, or an old white sheet. Leave that under the car overnight. The next day, check the color of any stains you may find. The odor will also be a good indicator.

Amber

Gasoline. Failing that, check for that distinctive gasoline smell.

Clear

This is either water from the condenser of the A/C unit, or power steering fluid.

Light Brown

If you smell rotten eggs, this is probably gear lube. Other than that, if you change your oil regularly, that's what's leaking.

Dark Brown

Most likely oil, if you haven't been changing it every three to five thousand miles (or as specified by the auto's manual).

Bright Green

Radiator coolant, especially if it's slippery to the touch.

Bright Blue

Winter windshield washer fluid. Could also be orange, pink, yellow.

Red Fluid

Either automatic transmission fluid or power steering fluid.

Light Yellow

Brake fluid. May be darker (down to muddy brown) as the brake fluid absorbs water during use. Brake fluid should be changed every other year.

Where is it Coming From?

These fluid colors are specified by the government, to make the above process easier. Note the location of the leak source, as this will also help you make a proper diagnosis. As always, seek the help of a professional mechanic when unsure.

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