Fluid Leak Color Checker
Found a puddle under your car? The color tells the story. Select the color of the fluid to find out what's leaking and if you can still drive.
Direct Answer
Red/pink is usually transmission fluid, green/orange is engine coolant, dark brown/black is engine oil, and clear water is normal AC condensation.
Fluid Leak Colors
Warning: This tool provides general guidance, not a diagnosis. If the vehicle is running poorly, pull over immediately.
Select a symptom to see what it means and what to do next.
Assumptions we made
- Fluids retain their standard manufactured dye colors
Important limitations
- Extremely dirty fluids can all appear black over time
Step by step
How to use this tool
- 1
Place a piece of white cardboard under your car overnight.
- 2
Note the color and location of the spot.
- 3
Match the color in the tool: green/orange (coolant), red (transmission/power steering), brown/black (oil), clear (water/AC condensation).
- 4
Read the urgency and next steps.
Decision context
What this calculator helps you decide
Use Fluid Leak Color Checker when you need a quick, structured answer before you spend money, approve work, prepare a trip, compare options, or share information with a buyer, seller, shop, lender, or insurer. Enter the inputs you already know, review the result, then use the assumptions and limits below to decide what to check next.
Inputs and outputs
Start with the inputs that most affect this decision: Fluid Color. The output is meant to make the next step easier to compare, not to replace a written quote, inspection, policy document, loan disclosure, or local rule.
The main outputs are Likely Fluid, Severity, Can I Drive It?, Next Steps. If one input is uncertain, change that value and compare the result again before treating a single estimate as final.
Best-use cases
This page is built around the search intent: identify car fluid leak, red fluid leaking from car, green puddle under engine. It is most useful when you want to narrow a decision, prepare better questions, or avoid missing a cost, risk, fitment issue, paperwork step, or ownership detail.
Keep the assumptions visible while using the result. If your vehicle, location, driving pattern, quote, loan, insurance policy, or listing situation is unusual, use this as a planning screen and verify the final decision with the relevant document, professional, or local requirement.
Methodology
How the estimate works
Inputs, outputs, and calculation logic.
Logic
Categorizes automotive fluids by their industry-standard dyes to identify the leaking system.
Inputs
- Fluid Color
Outputs
- Likely Fluid
- Severity
- Can I Drive It?
- Next Steps
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