Short answer
Five places
A cooling system leaks at a hose, the pressure cap, the reservoir, the water pump or the thermostat, plus the heater core, which leaks into the car rather than onto the ground. Three of those you can check yourself, cold, in about a minute, and the parts behind all six run $17 to $207 over the counter.
OilAndMiles.com - A coolant leak announces itself in one of two ways, and they aren't equally easy. Either there is something on the driveway, or the level in the reservoir keeps dropping and the driveway stays dry. The second is the one people search at midnight, and it's the one most pages skip.
What follows is where the fluid actually comes from, how to find it when nothing is dripping, and how long you can reasonably keep driving. Prices are covered too, but briefly. They have a page of their own, because the range runs from $496 to $1,902 and that deserves more than a line.
What does a coolant leak look like?
Coolant is dyed on purpose, and the dye is the first thing to read. Green, orange, pink, blue or yellow, watery rather than oily, faintly sweet, and slightly sticky once it dries. Green fluid leaking from a car is coolant almost every time; so is orange, and so is pink, which is where people get caught out because pink also describes transmission fluid.
The difference is texture. Coolant is thin and watery and won't cling to your fingers; transmission fluid is oily and does. If you're still unsure, our guide to identifying every fluid a car can drop separates all five by color, feel and where each one lands.
What the color does not tell you is which system, which brand, or how urgent it is. The dye is chosen by whoever bottled it, and two coolants of the same color can be chemically different. Read it to confirm you're looking at coolant, then stop reading it.
Which five places does it come from?
The cooling system is a closed loop under pressure, which is why coolant only leaves where a joint, a seal or a wall has failed. There's no slow evaporation and no normal consumption. If the level fell, something let it out.
Three of the five are visible from the fender with the hood open: the upper hose, the pressure cap and the reservoir. These are also the three cheapest to put right, which isn't a coincidence. They're the parts a technician can reach without taking anything else off first.
Use this image
Free to republish under CC BY 4.0: credit Oil & Miles and link to this page. The snippet does both.
<a href="https://oilandmiles.com/articles/coolant-leak"><img src="https://oilandmiles.com/assets/img/diagrams/coolant-where-to-look.svg" alt="Three cooling-system parts marked on a photograph of a modern engine bay: the upper radiator hose, the radiator cap, and the coolant reservoir whose cap is stamped COOLANT" width="1000" height="950"></a> <p>Diagram: <a href="https://oilandmiles.com/articles/coolant-leak">Oil & Miles</a>, CC BY 4.0</p>The other two are the , which hides behind whichever belt drives it, and the thermostat, which bolts to the engine underneath something that usually has to come off first. Add the heater core, which isn't under the hood at all: it sits behind the dashboard, and when it leaks the coolant lands on the passenger carpet instead of the ground.
Coolant leaking from the bottom of the car is the most common description people give, and it narrows things less than it sounds. Gravity moves fluid before you see it, so where it lands is a hint rather than an answer. A hose weeping at the top of the engine can drip off a crossmember two feet away.
What the data says
8,933 complaints filed with NHTSA for model years 2010 to 2025 describe a coolant leak in their own text. Most name no part at all, and among those that do, the counts aren't in the order people expect.
996, water pump 845, reservoir or expansion tank 787, radiator 518, hose 460, thermostat 342, and the heater core last at 86. So the two destinations that leave a driveway clean are both on that list, and the expensive one is named eleven times more often than the cheap one.
The record is also concentrated to a degree nothing else here is. Ford accounts for 5,196 of the 8,933, and three models carry most of it: Escape 2,638, Edge 1,054, Fusion 862. Per 1,000 complaints of any kind, Ford runs 29.7 against Chevrolet's 6.2.
NHTSA consumer complaints, FLAT_CMPL bulk file dated August 25, 2026, scanned September 16, 2026. Complaints count the people who reported, not a failure rate, and a make with a famous fault attracts reports.
How do you find one you can't see?
Start with the two free methods, because between them they settle most cases and neither costs anything but patience.
We ordered these by what they cost rather than by how well they work, because the two free ones settle most leaks and the paid ones only earn their money on what is left. Four methods, and each finds something the one above it can't:
- Cardboard under the car overnight. Free. Finds anything dripping to the ground, and tells you the color and roughly where.
- Look cold, then look warm. Free. A seep only opens under pressure, so cold-then-warm catches what a single look misses.
- A pressure test at a shop. $60 to $88. Seals the system and pumps it up cold. A leak too slow to drip shows as a falling gauge.
- UV dye, then a second visit. Dye circulates for a few days and shows the exact seam under a lamp. For the leaks a pressure test proves but can't place.
The first two cost nothing and settle most cases. Pay for the third when the level drops and the ground stays dry, because that's the pattern the ground can't explain.
Cardboard under the car overnight does two jobs at once: it catches the color, and it records where the drip lands relative to the wheels. Concrete soaks the stain gray and tells you neither.
Looking twice matters more than looking harder. A seep that has closed up cold will open once the system comes up to pressure, so a cold inspection and a warm one find different things. Never open a cap on a warm engine to do it: the system is pressurized and the fluid is above its boiling point.
When the level falls and the ground stays dry, stop looking and pay for the pressure test. The system is sealed and pumped up cold, and a leak far too slow to drip while you watch shows up as a falling needle in two minutes. It's the cheapest line on any coolant invoice, and what the test costs is set out with the rest of the figures.
What owners report
A clean pressure test doesn't always end it. One thread on the Ford Escape Forum, opened in March 2014 and still running at 31 pages, is owners of the 1.6 EcoBoost losing coolant that nobody can find.
One owner, July 2020, after several dealerships had tried: "The last time they actually kept the car overnight and did a pressure test. No drop in pressure in 24 hours and no coolant loss. Yet the problem continued." Another, January 2023: "Had my dealer pressurize the system during an oil change and he found no visible leaks", while adding "about a cup of coolant about every 100 miles."
Both accounts end in the same place, a leak inside the engine rather than out of it. Worth knowing before a clean test is read as an all-clear: it's the right next step, and it's not the last word.
Ford Escape Forum, thread 2013-2015 1.6 Coolant leak, posts dated July 11, 2020 and January 11, 2023. Read September 16, 2026. Owner accounts, not a diagnosis.
Where does it go when the ground stays dry?
Losing coolant with no leak and no overheating is the version that worries people most, and the phrase is slightly wrong: there's a leak. It simply isn't going anywhere you've looked. There are three destinations, and they're nowhere near equally expensive.
| Where it goes | What that means | The tell |
|---|---|---|
| Into the cabin | Heater core | Damp passenger carpet, a sweet smell inside, a windshield that fogs and won't clear |
| Into the engine | Head gasket | White smoke from the exhaust that doesn't clear once warm, or oil gone pale and thick |
| Out of the overflow | Pressure cap | Level falls steadily with nothing on the ground. The cap stops sealing and the system pushes coolant past it hot |
All three are separated by a pressure test rather than by looking harder. That's what a diagnosis fee buys, and it's why a dry driveway isn't reassurance.
Worth knowing
We put the pressure test third rather than first because the two free checks above it settle most cases, and we would rather not send you to pay for something a piece of cardboard answers.
A dry driveway isn't evidence of anything. Two of these three destinations leave the ground completely clean, and one of them is a head gasket.
That's the argument for spending $60 to $88 on a pressure test rather than another week of checking the floor: the test separates all three, and looking harder separates none of them.
How long can you keep driving?
Days, not weeks, and only while the temperature gauge stays where it belongs. Coolant is more forgiving than brake fluid and much less forgiving than engine oil, and the reason is the consequence rather than the rate.
The gauge is a real warning system and you should use it. But overheating warps cylinder heads and destroys head gaskets, and those are four-figure repairs reached from a leak that started as a $496 hose. The moment the needle climbs, the question stops being what the leak costs and becomes what the overheating cost.
Top the system off with the correct coolant, watch the gauge on every drive, and get it looked at inside the week. If the level needs topping more than once in that week, stop driving it.
What does each one cost?
Briefly, because the detail lives on its own page. Across the five repairs the range runs $496 to $1,902, and what moves it's not the part but how far into the car the leak sits.
A hose job runs $496 to $555. A heater core runs $1,370 to $1,902, and yet the part inside it costs $42. Here's what each of the six costs over the counter.
What a coolant leak costs in parts, by leak point
Counter prices for one car, parts only. What a shop bills for the same part is higher, and labor is on top of it.
| Radiator hoseDuralast, the upper hose at the low end and the molded lower hose at the high | $21 – $51Part only, at the counter |
|---|---|
| Pressure capDuralast, the plain cap at the low end and the safety lever cap at the high | $17 – $22Part only, at the counter |
| ReservoirDorman, the only brand listed for this car, and its cap is another $17 | $24Part only, at the counter |
| Water pumpDuralast up to Beck/Arnley, with ACDelco Gold and AISIN between them | $102 – $207Part only, at the counter |
| ThermostatDuralast up to AISIN, and every one of them a housing assembly with the gasket in the box | $40 – $138Part only, at the counter |
| Heater coreDuralast, the one part here that no second brand makes for this car | $42Part only, at the counter |
AutoZone counter prices for a 2017 Honda Accord 2.4L, read September 1, 2026. Every brand listed as fitting this car, parts only, with no coolant and no labor. Checked against Walmart for the same car, where a heater core is $37.
An invoice will show a bigger parts figure than these, and the gap isn't a markup you're being cheated by. What a garage bills for a part carries the coolant that goes with it, the shop's own margin, and sometimes the maker's part rather than the aftermarket one on the shelf.
The rest of it is the hours between a technician and the seal, which is why the same fault costs different money on different cars. Our full breakdown of coolant leak repair cost prices each leak point separately and shows how much of every bill is labor.
One thing to settle before you buy anything off a shelf: a sealant poured in now circulates through every narrow passage in the system, not just the one that is leaking. Coolant stop leak has a real but narrow job, and both Ford and GM have published positions on it.
When you do top it back up, what goes in matters as much as how much. antifreeze and coolant differ, and the jug that says both may or may not already have water in it.
What should you do about the leak?
Six steps for tracing a coolant leak, cheapest first. Most are found somewhere in the first five, and the last one is the only one you pay for. 6 steps below:
- Check the level cold, against the marks on the reservoir. Never open a cap on a warm engine.
- Put cardboard under the car overnight. Color, texture and landing point together narrow the search before anyone charges you to look.
- Look once cold and once warm. A seep that hides cold opens under pressure.
- If the ground is dry, check inside the car. Damp passenger carpet, a sweet smell or a windshield that won't clear points at the heater core.
- If it is still hiding, pay for the pressure test. $60 to $88, and many shops credit it against the repair. Ask before you agree, not after.
- Stop the moment the gauge climbs. That applies at any point in this list, and it overrides every step above it. The line between a repair on this page and one well past it is drawn by the temperature needle, not by the leak.
From the documents
Ford names a number for this, and a way home
Two lines from one owner's manual do what no amount of looking can. One sets the threshold at which a slow loss stops being acceptable, and the other says what to pour in when you're stuck:
Ford owner manual, Engine Coolant Check, Coolant Refill Procedure, served for a US vehicle variant
If you have to add more than 1 qt (1 L) of coolant per month, have your dealer check the cooling system. Your cooling system may have a leak.
Ford owner manual, Adding Engine Coolant, same chapter
In case of emergency, a large amount of water without engine coolant may be added in order to reach a vehicle service location. In this instance, the cooling system must be drained, chemically cleaned with Motorcraft® Premium Cooling System Flush, and refilled with prediluted coolant as soon as possible.
The quart is the useful half. Everybody knows to watch the gauge, and the gauge only moves once the loss is already large; a measurable rate lets you tell a seep you can live with for a week from one you can't, before anything gets hot.
Conclusion
A dry driveway rules out nothing
There are six places it leaves from, and two of them never reach the ground. Cardboard overnight and a second look warm settle most of it for nothing. When the level falls and the driveway stays clean, that's the pattern the ground can't explain, and the $60 to $88 pressure test is what separates a heater core from a head gasket.
Then watch the needle rather than the puddle, because overheating is what turns a $496 hose into a four-figure repair. Oil & Miles prices the parts at a counter and reads the complaint record behind them, across symptoms and repair costs.
Common questions
Asked most often
Why is my car leaking coolant?
Because one of five things has failed: a hose, the pressure cap, the reservoir, the water pump or the thermostat. A sixth, the heater core, leaks into the cabin instead. Which one it is depends far more on where the fluid appears than on how much you're losing.
Is a coolant leak and an antifreeze leak the same thing?
Yes. Antifreeze is the concentrate; coolant is that concentrate mixed with water, which is what is actually in the system. The two words are used interchangeably by drivers, shops and manufacturers alike, and nothing about the diagnosis changes between them.
Does coolant stain concrete?
Yes, and it's one of the more stubborn automotive stains because the glycol soaks in before it dries. That's the practical argument for cardboard rather than the floor: it catches the color for you to read and saves the driveway at the same time.
Can I just keep topping it off?
For a few days while you get it seen, yes, with the correct coolant. As a strategy, no. Topping off treats the symptom of a system that is no longer sealed, and the failure that started as a weeping hose doesn't stay a weeping hose.
How much does it cost to fix a coolant leak?
It depends entirely on which of the five places it is coming from, which is what this page is for. A hose is the cheap end and a heater core the dear one, and the whole range is priced by leak point in our coolant leak repair cost article.
What people ask next
- P0128 Code: The Engine Never Got Warm Enough to Test Itself 20 min
- Coolant Stop Leak: When It Works and What It Wrecks 16 min
- Coolant Flush Cost: $107 to $231, Not $450 17 min
- Antifreeze vs Coolant: Are They the Same Thing? 12 min
- Head Gasket Replacement Cost: The Parts Are the Cheap Part 21 min
- Coolant Leak Repair Cost: $496 to $1,902, by Leak Point 15 min
Everything on coolant
A coolant problem splits cleanly in two, and the halves need different things from you. First: what is leaving the system, where from, and what it costs to stop. Then, once it is fixed, the question people get wrong far more often: what is supposed to go back in.
-
Losing coolant with a dry driveway means it is leaving through the engine. White smoke is the tell.
When it never reaches the ground
- $496 to $1,902, priced separately for all five leak points. The part is almost never what decides the bill.
- What a sealant can close, what it blocks instead, and what Ford and GM have put in writing about it.
- One names the ingredient, the other the mixture. Pour the ingredient in neat and protection gets worse.
-
A specification code, not a color. Ford lists two different specs that are both described as yellow.
Which one your car is owed
- Color is marketing, not chemistry. The additive package decides it, and the wrong two make sludge.
Sources
- Our own coolant leak repair cost article, where each figure is sourced: RepairPal estimator national averages read from archived copies of those pages dated June 18, 2026. The pressure-test range of $60 to $88 comes from the same source. Oil & Miles, from RepairPal archived June 2026
- AutoZone, counter prices for a 2017 Honda Accord 2.4L read September 1, 2026. For each of the six parts we took every brand the catalog lists as fitting that car, and checked the level against Walmart listings for the same car. AutoZone, read September 2026
How this was compiled
The complaint counts are absolute counts of people who filed, not failure rates, and a make with a widely known fault attracts reports. Everything else on this page is mechanism rather than measurement: where coolant goes, and what each destination looks like from the driver's seat. Nothing in that part needs a price to be checkable.
What we didn't do
- We didn't pressure-test a vehicle for this article.
- We give no figure for UV dye, because the shops publishing one bundle it with the diagnosis in ways that aren't comparable.
- We name no model as more likely to fail. Which of the five goes first varies by engine, and a list pretending otherwise would be guessing dressed as data. The one car named on this page is the car the counter prices were read for.
Prices are ranges compiled in August and September 2026 for the US market and vary by region, vehicle and shop rate. Prices from $10 up are rounded to the nearest dollar, so $14.13 reads as $14 and $14.52 as $15. Below $10 they're exact. This article is general information, not advice about your specific vehicle. See the disclaimer.
Water pump
The pump that circulates coolant, driven by the timing belt or chain on most engines.
Head gasket
The seal between the cylinder head and the block, holding back combustion pressure, coolant and oil at the same joint.