Something Is Leaking Under My Car,What Is It?

Seeing a mysterious puddle under your car can be nerve-wracking. Is it serious? Is it dangerous? Or is it something minor? The truth is, fluid leaks can be a red flag but identifying the type of leak is the first step toward getting your vehicle back in top shape.

Let’s break down the most common types of automotive leaks, how to spot them, and what to do next.

1. Engine Oil Leak

What it looks like: Dark brown or black fluid, usually thick.
Where it comes from: Oil pan, valve cover gasket, oil filter, or seals.
Warning signs:

• Oil puddles or spots under the engine
• Burning oil smell
• Low oil level
• Possible engine warning light

Why it matters: Ignoring it can lead to low oil levels and major engine damage.

2. Transmission Fluid Leak

What it looks like: Reddish or brownish fluid (can turn dark as it ages).
Where it comes from: Transmission pan, seals, gaskets, or cooler lines.
Warning signs:

• Difficulty shifting
• Slipping gears
• Transmission overheating

Why it matters: Transmission repairs are expensive. Catching a leak early can save thousands.

3. Coolant Leak

What it looks like: Green, orange, pink, or yellow fluid (slightly sweet smell).
Where it comes from: Radiator, hoses, water pump, heater core, or head gasket.
Warning signs:

• Overheating engine
• Low coolant warning
• Sweet odor from engine bay

Why it matters: Low coolant can lead to engine overheating and blown head gaskets.

4. Brake Fluid Leak

What it looks like: Clear to yellowish fluid with a slick texture.
Where it comes from: Master cylinder, brake lines, calipers, or wheel cylinders.
Warning signs:

• Spongy or soft brake pedal
• Reduced braking power
• Brake warning light

Why it matters: This is a critical safety issue. Get it inspected immediately.

5. Power Steering Fluid Leak

What it looks like: Reddish or light brown (can resemble transmission fluid).
Where it comes from: Steering rack, hoses, or pump.
Warning signs:

• Stiff or noisy steering
• Whining noise when turning
• Fluid puddle near the front of the vehicle

Why it matters: Driving without proper steering control is unsafe and will damage components.

6. Fuel Leak

What it looks like: Clear or amber fluid (with a strong gasoline or diesel smell).
Where it comes from: Fuel lines, tank, or injectors.
Warning signs:

• Fuel smell
• Poor fuel economy
• Drips under rear or mid-section of vehicle

Why it matters: Fuel leaks are dangerous and flammable this needs urgent attention.

7. Differential or Axle Seal Leak

What it looks like: Thick, dark oil dripping near rear (or front on AWD vehicles).
Where it comes from: Differential seals, pinion seals, or axle seals.
Warning signs:

• Fluid around tires or axle area
• Whining noise during turns
• Uneven tire wear

Why it matters: Low fluid levels can damage your drivetrain and shorten component life.

8. Air Conditioning Refrigerant Leak

What it looks like: Typically not visible, though some may use UV dye.
Where it comes from: Compressor, condenser, evaporator, or hoses.
Warning signs:

• Warm air from AC vents
• Hissing noises from under the dash or engine bay

Why it matters: AC won’t work efficiently, and leaking refrigerant isn’t environmentally friendly.

What Should You Do If You See a Leak?

Don’t ignore it. Some leaks may seem small but can become expensive or dangerous quickly. If you notice any new spots or puddles under your car, take note of the color, consistency, and smell and give us a call.

Get Leaks Inspected at ABC Auto Repair in Burien

At ABC Auto Repair, we’ll identify the source of the leak, inspect the surrounding components, and give you a clear, honest diagnosis. Whether it’s a minor gasket or a more serious issue, we’ll get you back on the road safely with no guesswork.