Water Pump
What it is
The water pump circulates coolant through the engine and radiator to keep the engine at the right temperature. It is usually driven by the serpentine or timing belt.
What it does
It keeps coolant flowing so the engine does not overheat. A failing pump leaks coolant or loses flow, causing overheating, a sweet coolant smell and sometimes a whine or wobble from the pump.
Symptoms of failure
- Engine overheating or temperature gauge climbing
- Coolant leak / puddle under the front of the engine
- Whining or grinding from the pump (bad bearing)
- Sweet coolant smell
- Low coolant level and steam
Which vehicles need it
Every liquid-cooled engine. On timing-belt engines it is wise to replace the pump with the belt.
Replacement cost
| DIY (part only) | $30–$150 |
|---|---|
| At a shop (parts + labor) | $350–$900 |
| Replacement interval | No fixed interval — often 60,000–100,000 miles; replace with the timing belt if belt-driven. |
| DIY difficulty | Moderate–Hard (DIY) — coolant drain and belt access; timing-belt pumps are a bigger job |
| Recommended brands | Gates, GMB, Aisin, ACDelco |
Where to buy the part
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Frequently asked questions
Can I drive with a failing water pump?
No — a failed pump means no coolant flow and rapid overheating, which can warp the head or destroy the engine. If you see a coolant leak or the temperature climbing, stop and fix it.
Should I replace the water pump with the timing belt?
On timing-belt engines, yes. The labour to reach the pump overlaps with the belt job, so replacing both together saves a second teardown and is cheap insurance.