The underside of the filler cap is covered in a mayonnaise-like substance – although this is more likely to be caused by condensation if the car is only ever used on short journeys.Coolant mixed with the oil (turning it milky if there is a severe leak).If it has, it could be leaking coolant into the combustion chambers. If the car has recently overheated then this could have caused the head gasket to fail. If the coolant level is dropping and there is no external leak evident, then the coolant is probably leaking internally, into the engine. 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 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. There are two kinds of coolant leaks: internal and external. Coolant leak: the difference between internal and external leaksĪ car’s coolant doesn't just evaporate into thin air when it leaks (well, not all of it, anyway). 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. 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. 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. If you haven't just renewed the coolant, there's a good chance there is a leak, either from the radiator or somewhere else. 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 are a couple of reasons why your car's coolant level might be low, and a leak won't always be to blame. Discover which Haynes Manual is best for you.NEW Fault Finder - Diagnose the problem.
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