Diagnosis Brief
what this complaint usually turns out to be
what this complaint usually turns out to be
Fluid Leaking From Your Car — What It Usually Is
How real visits for a fluid leak ended at independent shops across the US — the part actually replaced, how often, and what it cost when it was the only fix.
Gasket / seal
The single most common outcome — about a third of these visits when combined with the runner-up
Gasket / seal $64 – $444
Hose $103 – $387
typical cost when it was the only fix
(parts + labor)
(parts + labor)
| The fix involved | Share of these visits* | Typical cost† | Median |
|---|---|---|---|
| Gasket / seal | $64 – $444 | $188 | |
| Hose | $103 – $387 | $207 | |
| A/C refrigerant | $107 – $264 | $162 | |
| Brake fluid | $106 – $366 | $203 | |
| Power steering | $142 – $510 | $289 | |
| Radiator | $189 – $624 | $401 | |
| Water pump | $261 – $651 | $394 | |
| Thermostat | $163 – $404 | $260 | |
| Brake line | $130 – $339 | $207 | |
| Other, rarer causes | smaller shares — axle seals, differential covers, coolant reservoirs, washer systems | varies | — |
*Share of visits whose repair involved this part; combined repairs count toward each part, so shares overlap and don't add to 100%. †Middle half of real invoices when this was the only fix — parts + labor, all vehicle types.
Which one is yours? Listen first
- Red fluid — Transmission and power-steering fluid share the red family — location decides (center-rear vs front).
- Clear water — A clear, odorless puddle under the passenger footwell area in summer is A/C condensation — the system working as designed, not a leak.
- The leak that moves — Fluids travel along the underbody before dripping, so the wet spot is often downstream of the source.
What to expect from the shop
First question: which fluid? Color and location narrow it fast — expect the shop to identify the fluid and clean and dye the area before naming a part. Seals, gaskets and lines lead these outcomes. A leak that's just a seep may be monitored; anything hydraulic (brakes, steering) gets fixed now.
About this data · How to use this brief
Vehicles all makes and models, US fleet
Data confidence High — large sample, stable shares
Records through July 2026, refreshed continuously
Source paid invoices from independent US repair shops
Data confidence High — large sample, stable shares
Records through July 2026, refreshed continuously
Source paid invoices from independent US repair shops
Take it to the shop. It tells you what the likely answers are and what each one should cost — so when the diagnosis comes back, you already know whether the number fits. Vehicle-specific price reports for the common fixes are on fixdozer.com.