
The pink fluid in your car is most commonly automatic transmission fluid (ATF) or a specific type of coolant (antifreeze). To tell them apart, check the reservoir. If the pink fluid is in a reservoir marked with a steering wheel icon or "Power Steering" or "Transmission," it's ATF. If it's in a reservoir marked with a thermometer icon or "Coolant," it's a specialized coolant, often an Organic Acid Technology (OAT) or Hybrid Organic Acid Technology (HOAT) formula common in many modern vehicles.
Automatic transmission fluid is a hydraulic fluid that lubricates gears, cools the transmission, and provides the pressure needed for smooth gear shifts. Using the wrong type can cause severe damage. Many manufacturers, like Honda and Acura, use a distinctive pink or reddish fluid (e.g., ATF DW-1) for their transmissions and power steering systems.
Pink coolant is an extended-life formula designed for longer service intervals, typically up to 5 years or 150,000 miles. It's crucial not to mix different coolant colors (like green, orange, or yellow) as the chemical inhibitors can react, forming sludge that clogs the cooling system and leads to overheating.
| Fluid Type | Common Vehicle Makes | Key Function | Typical Service Interval |
|---|---|---|---|
| Automatic Transmission Fluid (ATF) | Honda, Acura, Toyota, some Fords | Lubrication, cooling, hydraulic pressure for gear shifts | 30,000 - 60,000 miles |
| Power Steering Fluid | Honda, Acura (often uses ATF) | Transfers hydraulic pressure for easy steering | Check owner's manual; often 50,000 miles |
| OAT/HOAT Coolant | General Motors (Dex-Cool), many European brands | Engine cooling, corrosion protection, freeze prevention | Up to 5 years / 150,000 miles |
If you find a pink puddle under your car, identifying the fluid correctly is the first step to addressing the leak. Always refer to your vehicle's owner's manual for the exact fluid specification to ensure proper performance and longevity of your car's systems.

Check your owner's manual. Seriously. Pop open the hood and look at the reservoir caps. The one with a little steering wheel symbol? That's for power steering, and it's often pink. The one with a thermometer? That's coolant. My Honda uses the same pink fluid for both. If you see a leak, don't just top it off with any pink stuff—get the specific type your car needs. Wrong fluid can mean a very expensive repair.

I learned this the hard way with my old Chevy Traverse. I saw a pink spot on the driveway and panicked. Turns out, it was the coolant, which they call Dex-Cool. It's an extended-life formula that's supposed to last a long time, but the seals can get brittle. The mechanic told me it's super important not to mix it with the standard green coolant. Now I just keep an eye on the level in the clear plastic reservoir off to the side of the engine. It’s an easy thing to check yourself.

Here’s a quick guide to identify the pink fluid based on location under the hood:
| Feature | Power Steering/Transmission Fluid | Engine Coolant |
|---|---|---|
| Reservoir Location | Typically near firewall, behind engine | Usually at the front/side of engine bay |
| Reservoir Cap Label | "Power Steering," "ATF," or steering wheel icon | "Coolant," "Antifreeze," or thermometer icon |
| Fluid Consistency | Slick, oily, thin | Slightly slimy, watery (never oily) |
| Common Leak Source | Hose connections, rack and pinion seals | Radiator hoses, water pump, radiator itself |
A quick visual check of the reservoir and its label will give you the answer 99% of the time. If the reservoir is low, top it up with the correct fluid and monitor for leaks.


