FixCoolant Leak — Where It Usually Comes From, and What It Costs
A sweet-smelling puddle (green, orange, or pink) or a coolant level that keeps dropping — the sources are a short list, and the outcomes below show which ones dominate real visits.
What it actually turns out to be
| The fix involved | Share of visits* | Typical cost† | Median |
|---|---|---|---|
| Water Pump | 30.5% | $261 – $651 | $394 |
| Radiator | 28.4% | $189 – $624 | $401 |
| Thermostat | 20.2% | $165 – $408 | $262 |
| Hose | 17.8% | $103 – $387 | $207 |
| Gasket / Seal | 15.0% | $65 – $444 | $188 |
| Radiator Hose | 10.3% | $130 – $386 | $234 |
| Intake Manifold | 2.6% | $253 – $740 | $445 |
| Pipe / Tube | 2.4% | $26 – $196 | $65 |
| Other, rarer causes | smaller shares | varies | — |
*Share of visits whose repair involved this part. Combined repairs count toward each
part involved, so shares overlap and don't add up to 100%. Among visits that ended in a parts repair.
†Middle half of real invoices (25th–75th percentile) when this was the only fix — parts + labor, all vehicle types.
Real repair reports
These are recent, paid visits for this complaint — the words as the owner said them, and what it turned out to be.
Car owners said
“Coolant leaking under car.”
“Check radiator for leaks”
“Check for over heating and coolant leak”
“Coolant recovery tank leaking”
“Diagnostic - coolant leak”
“Cooling System Performance Test- Coolant Leak”
What the technician found
“Tech inspected and confirmed that the leak is at the inlet heater hose where the crimps are. tech recommends replacement of the heater hose and then rechecking.”
“Performed coolant leak inspection Water pump leaking coolant - recommend thermostat replacement Replaced water pump and thermostat with new components Filled cooling system with new coolant Performed vehicle road test - ok”
“pressure test coolant system. Found slow leak at the bottom of the radiator. Exhaust need new flex pipe section.”
“Customer states there is a bad coolant leak. he has topped up weekly. there is also an oil leak but not as severe. seeing coolant pool mainly at rf corner.”
Puddle under the front middle
Radiator and water pump are the two leaders, and they sit near each other at the engine's front. Radiator end-tanks crack with age; water pumps weep from their bearing seal before failing outright.
Drips near hoses or clamps
Hose ends and clamps are the cheap end of coolant leaks — and among the most common. A pressure test finds them in minutes.
No puddle but the level drops
Coolant disappearing without a trace either exits as steam from a small hot-surface leak — or, worst case, is entering the engine. White exhaust smoke or a sweet smell inside the cabin moves this from maintenance to urgent diagnosis.
Costs by vehicle
- Water Pump: Ford F-150 · Jeep Grand Cherokee
Take this to the shop
The FixDozer Diagnosis Brief puts this page on one printable sheet: what this complaint usually turns out to be, how often, and what each fix should cost — so when the diagnosis comes back, you already know whether the number fits.
Download the Diagnosis Brief (PDF)View it online · Narrow it down for your vehicle