Color, smell, spot — the same three looks a technician takes from the driveway. 9 real fluid profiles, each with what the leak proves, whether you can drive, the paper-towel test that confirms it, and the parts to refuse buying before anyone finds the actual source.
Naming the fluid is the driveway's job · Finding the leak's source is the meter's job · This tool tells you which one you need next
Pick a color to start — one tap, and the puddle has a name.
No — and this tool won't pretend otherwise. Naming the fluid (color, smell, where it lands) is the driveway half, and it decides the urgent question: can this car be driven, and how fast is it losing what it needs. Finding the SOURCE — which hose, seal, or gasket — takes dye, pressure, or a look from underneath, which is the meter work the flat $150 mobile diagnostic does. The tool narrows; the visit names.
Mostly yes in Texas summer — A/C condensation is the single most common driveway puddle and it means nothing is wrong. The two exceptions: clear and OILY means a fluid, not water (brake, power steering, or ATF that has lightened with age — the smell/feel question exists to catch this), and clear water appearing INSIDE the cabin means the A/C drain has clogged. Damp carpet with a dry driveway is the puddle going the wrong way.
Three, and the checker flags them in red: fuel (a fire question, not a repair question — park it outside), brake fluid (a closed system that has opened — the 30-second pedal-hold test decides whether it's a tow), and milky pink fluid in the overflow tank (transmission fluid inside the cooling system — every mile pumps the contamination through the clutch packs). Everything else is a clock, not a cliff.
For oil and coolant, topping to the mark and MEASURING the loss per week is legitimate triage — the rate is what converts 'watch it' into 'this week.' For brake fluid and fuel, no: those aren't consumption leaks, they're openings, and refilling either one is postponing a decision the car has already made for you. And never accept a stop-leak additive as a repair — a bottle that 'fixes' a seal hides the leak from the dye test that would have named it.
A dye-and-pressure (or smoke, for vapor) check that puts the leak's exact origin in writing, with photos and the repair path priced from real shop rates — no rebuild scare attached to a drip. The visit is a flat $150 plus a $35 trip fee within 25 miles of Canyon Lake. If we can't find the root cause, you don't pay the diagnostic fee. Period.
No — deliberately. We diagnose and hand you the written report; whoever you choose installs the part. That's the whole business model: the person finding the fault can't profit from fixing it, so the leak that's a $20 clamp gets reported as a $20 clamp instead of a $2,800 scare.
Color, smell, and where it lands — that's everything a good technician asks before opening a hood. Nothing you can't do with a paper towel and ten minutes.
Fuel smell, a wet brake wheel, or a milkshake in the overflow tank are park-it answers, and this tool says park in red instead of booking you a maybe.
Naming the fluid never names the part. The $150 flat visit dyes, presses, and points at the exact opening — in writing, with the repair path priced honestly.