Also check the carpet under the dashboard for any signs of moisture – and use your nose. If it's leaking, the interior will almost certainly smell 'coolanty'. Your heater may also not work as effectively, if at all.

Larger splits will be obvious if you have a good look around the engine. Also inspect where the metal clips secure the hoses at each end – over time they can 'bite' into the rubber and cause splits.

It may be evident with traces of car coolant around the engine bay and even on the underside of the bonnet, because the coolant pump pulley can fling the coolant everywhere!

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Stone chips and age are a radiator's worst enemy. The trouble is, if the radiator leak is small, the car coolant could evaporate before it's had a chance to pool on the floor and give away its location.

If you haven't just renewed the coolant, there's a good chance there is a leak, either from the radiator or somewhere else. Car coolant is contained within a sealed system, so if it's in good condition the coolant level shouldn't change if it's checked when the engine is cold. The level will rise when the engine is warm because water expands when it's hot, but it'll fall back to the 'cold' level when it cools.

The same is true for cars without a header tank, because the radiator cap performs the same function, and can fail over time.

If the level is dropping, don't panic. Coolant leak repair is usually straightforward – just be prepared to spend some time with your head under the bonnet, because some leaks can be tricky to locate.

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If there are no puddles beneath the vehicle, yet the coolant level is dropping, you have an internal leak, which means the coolant is leaking into the engine.

If the head gasket has failed, there is only one solution, and that's to strip the engine down and replace the gasket. Your Haynes Manual will show you how to do this.

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The car coolant header tank is equipped with a pressure release valve in the filler cap, intended to release coolant harmlessly in the event that the pressure within the system is too great.

So if you can't find any apparent radiator leak, look for small puffs of steam emanating from the radiator when the car is hot, or any discoloured areas on the radiator's fins. There will also be more evidence than the usual smell of coolant in the engine bay, so get sniffing!

A garage can use a gas analyser to detect a head gasket leak. It tests for hydrocarbons (unburnt fuel) in the coolant system. If there is any present the gasket is blown.

This will reveal itself with coolant residue around the header tank (shown here). If the coolant system is otherwise in good order a new cap could be the solution.

If the coolant level is dropping and there is no external leak evident, then the coolant is probably leaking internally, into the engine.

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Even the tiniest pinprick in a hose can cause a coolant leak, and sometimes this leak is only evident when the engine is hot.

The heater matrix's location makes it difficult to spot a leak promptly, but if you've recently noticed both coolant loss and condensation on the inside of the windows, it could point to the matrix being at fault.

If the car has recently overheated then this could have caused the head gasket to fail. If it has, it could be leaking coolant into the combustion chambers.

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There are two kinds of coolant leaks: internal and external. If you can locate a drip on a hose, the engine block or can see a radiator leak, and there's a pool of coolant under the car, then it's an external leak.

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This pressurises the system to replicate the effect of a running engine. As a result any coolant leak will be more obvious.

Pretty much anything that either carries water or prevents water from exiting the engine can be at fault, whether that's a split header tank, a leaking thermostat gasket or a hose not properly secured.

The coolant pump has a seal which prevents coolant from leaking past the bearing. If this seal fails then coolant can seep out where the coolant pump pulley shaft enters the pump housing.

There are also situations where there is a leak, but the cause is not apparent – a very small leak in the radiator for example could evaporate away before it's noticed, as mentioned above. In these instances it's worth getting a garage to carry out a coolant pressure test.

There is also the option of a leak-down test which pressurises the engine (through a spark plug hole) and monitors the pressure loss.

Your car's coolant also keeps you nice and warm in the winter via the heater matrix. This is usually mounted deep behind the dashboard and occasionally leaks.

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You might have just changed the coolant and the air locks in the system have now cleared and the coolant needs to be topped up to the correct level.

There may not be enough pressure in the system with the car just ticking over to make the leak apparent. But there will be telltale signs of coolant around where the leak is because it often leaves behind a coloured residue.