Do you have a fluid leak under your car or truck? Here’s a simple way to investigate if you’re not sure whether it’s oil, transmission fluid, coolant or brake fluid.

Place an old sheet or large piece of white cardboard under the vehicle overnight. In the morning you will have your answer. Each fluid is a different color to help you diagnose the answers.

If the leaks have the following color, you’ll have a good idea of what fluid is leaking.

Bright green: Radiator coolant. This is also very slippery to the touch.
Light or dark brown: If oil is changed often it will be a light brown, if not the fluid will be darker brown. Engine oil change is recommended every 3000 to 5000 miles.
Bright blue: Windshield washer fluid. (Winter washer fluids can be orange, pink or yellow).
Light brown: If there is also a strong odor of rotten eggs, this is 90 weight or gear lube. It may be leaking from the rear axle center section or the manual transmission.
Red: Automatic transmission fluid or power steering fluid. Note where the fluid is coming from - it could be long life coolant
Clear: Power steering fluid or water from the condenser on the airconditioning unit.
Light yellow: Brake fluid is light yellow when new. As it absorbs water the fluid becomes a dark muddy brown. Brake fluid absorbs 2% water over a one year period under normal braking conditions. This is a very important fluid and should be changed every other year.
Amber: fuel - and there will be a distinct odour.

The location of the leak could also be a clue. It’s not likely that there will be an anti-freeze leak at the back of a vehicle.

The government tints fluids different colors for safety reasons. This will also assist during maintenance schedules too.

Keep a sharp eye on your vehicle. Leaks can be frustrating and possibly dangerous. If you’re unsure, go to a professional mechanic and get help.