Change Car Water Pump
The water pump circulates the coolant through the engine and radiators, keeping the engine at its ideal operating temperature. A failed pump can cause the engine to overheat and, in turn, the timing belt to snap.
Often tied to the timing belt
On many engines the water pump is driven by the timing belt. In that case it is replaced as a matter of course when the belt is changed, because reaching it needs the same strip-down. That is why the cost is often included in the timing-belt package.
How does the water pump work?
The water pump is usually a centrifugal type, driven either by the timing belt or by the auxiliary (drive) belt. On vehicles with stop-start or hybrids, an additional electric pump may back it up. Its advantage is that it can run even with the engine switched off.
When should you change the water pump?
The water pump is a part to replace preventively, generally at the same time as the timing belt or auxiliary belt. The interval ranges from 60,000 to 240,000 km depending on the engine. Check your service book.
Difficulty levels by type of installation
Additional electric pump
- Accessible without major dismantling
- Needs a hose clamp so you do not drain the whole system
- Quick, inexpensive job
Pump on the auxiliary belt
- Replacing the auxiliary belt at the same time is recommended
- Needs a cooling-system filling tool
- Allow for the coolant (£12 to £20)
Pump on the timing belt
- Complex job needing the timing-belt locking tools
- Change the belt, tensioner/idlers and pump together
- Strongly recommended to leave to a professional if you are not equipped
Price
The average price of a water pump at a garage is around £75 (part only), excluding labour. From a motor factor: £35 to £80 depending on the model.
