The Dacia Logan MCV suffers in some cases from overheating problems that are mainly caused by cooling system failures such as leaks, faulty fans and damaged cylinder head gaskets. These problems occur especially with models fitted with TCe engines (turbo engines with direct fuel injection) and require timely maintenance to prevent serious engine damage. Find out what to do in case of overheating and which symptoms you need to recognise.
What to do if your Dacia Logan MCV overheats
The Dacia Logan MCV can overheat. This requires immediate action. Pull over safely at the side of the road and let the engine cool down before opening the bonnet. Check the coolant level in the expansion tank. Is the level below the minimum mark? Then top it up with the correct coolant according to the prescribed specification. Note: never open a hot radiator cap; the hot fluid will spray out under pressure and cause severe burns.
If the engine warning light is on or the temperature gauge reaches the red zone, it is wise not to continue driving. Visually check under the car and around the bonnet for visible leaks. Do you see coolant dripping? Then there is probably a leak in the cooling system. In this case it is better to call in professional help. Have the car towed to a garage or contact your Dacia dealer for diagnosis.
‘ In 2022 models, overheating regularly occurs due to a failing coolant pump. ’
Common causes of overheating
Coolant leaks are among the most common causes of overheating in the Logan MCV. In 2022 models, overheating regularly occurs due to a failing coolant pump. This leads to a rapid rise in temperature. The rise occurs mainly under load such as motorway driving or driving with a fully loaded car. Visible leaks under the car often point to a defective pump, worn hoses or a damaged radiator.
Models with TCe engines sometimes show overheating due to increased oil consumption or timing chain problems. This indirectly affects cooling and causes additional engine stress. A defective cooling fan means the radiator does not get cooled sufficiently. This happens especially when stationary or driving slowly in town. A fan that is not running is often audible by its absence: the engine gets hot, but you do not hear the fan whirring behind the radiator.
In cold conditions, moisture that has collected in the lower hose of the intercooler can freeze. In warmer weather this contributes to cooling problems due to reduced efficiency of the cooling system. These problems are not universal, but they are worth mentioning in the case of intensive use.
Symptoms of a blown head gasket
A damaged cylinder head gasket is a serious fault that often goes hand in hand with specific symptoms. White smoke from the exhaust is a common sign. This smoke occurs because coolant leaks into the combustion chamber and evaporates there. The exhaust also gives off a sweet smell, which also indicates burning coolant.
Other symptoms are:
- Oil in the coolant reservoir or a brown, creamy substance under the oil filler cap
- Coolant that drops quickly without visible external leaks
- Engine running unevenly or starting roughly
- Bubble formation in the expansion tank while the engine is running
- Increased pressure in the cooling system, making the hoses feel hard
A blown cylinder head gasket requires immediate repair. If you keep driving, this will lead to serious engine damage such as a warped cylinder head or even complete engine failure. The repair is costly and labour-intensive, so timely diagnosis will save you a lot of money and worry.
Tracing and repairing a coolant leak
Tracing a coolant leak starts with a visual inspection. Check all hoses between the radiator, thermostat and engine for cracks, swelling or damp spots. Also look at the radiator itself: corrosion or small holes cause leaks. The water pump gaskets and the thermostat housing are also sensitive areas where leaks arise.
For a thorough diagnosis, test the coolant pressure with a pressure gauge. This device pressurises the cooling system while the engine is cold. If the pressure drops quickly, there is a leak somewhere. Sometimes leaks are only visible when the engine is warm and under pressure, so it helps to carry out the test after the engine has been up to temperature.
The repair depends on the location and severity of the leak. A damaged hose is relatively simple and inexpensive to replace. A leaking radiator often needs complete replacement, which is more expensive. A defective coolant pump must be replaced completely. This job takes a few hours of work on the Logan MCV. It is best to have this done by a specialist who is familiar with Dacia models.
‘ Using water only is not recommended, as it offers no protection against frost and corrosion. ’
Practical maintenance tips for the cooling system
Preventive maintenance ensures your Logan MCV keeps driving without problems. Check the coolant level weekly and top up if necessary. Always use the coolant prescribed by Dacia to prevent corrosion and deposits. Using water only is not recommended, as it offers no protection against frost and rust.
Have the timing chain and oil consumption inspected on TCe engines. Do this every 20,000 kilometres. Replace the coolant pump proactively if the temperature gauge behaves abnormally. Also replace the pump if you hear unusual noises from the engine bay. Flush the intercooler if there is moisture build-up. Use antifreeze with the correct dilution for both winter and summer protection.
Check the temperature gauge regularly during motorway journeys. Does the needle rise towards the red zone? Then reduce your speed and set the heater to the highest setting. This helps to remove extra heat. At high mileages, have the radiator flushed through. At the same time, replace the contaminated coolant.
Diagnosis for warning lights and fault codes
An illuminated engine light or warning light (check engine light) requires immediate diagnosis. Scan the car with an OBD reader (On-Board Diagnostics reader) to check for fault codes. Codes related to coolant temperature sensors, thermostat or fan relay indicate the cause of the overheating. Many garages offer a free scan, but you can also buy a simple OBD scanner yourself.
Also check the earth and positive connections on the battery and alternator. Corrosion or loose connections lead to poor power supply to the cooling fan, causing it to work poorly or intermittently. Test the condition of the battery and alternator, especially if you are also experiencing other electrical problems such as slow wipers or weak lighting.
Owners occasionally report that overheating complaints coincide with other issues such as defective track rod ends or electrical faults. This does not necessarily have a direct link, but it does underline the importance of general periodic checks. High-mileage users emphasise that regular servicing keeps the Logan MCV cheap to run and maximises reliability.
More information on Dacia problems
On the Carnews website you will find extensive information about common problems with various Dacia models, maintenance schedules and practical tips for solving technical issues. Whether you want to know more about other Dacia Logan MCV problems or are looking for advice on other car models, Carnews offers a wealth of knowledge for every car enthusiast. Discover more articles and stay up to date with the latest developments in the automotive world.
Frequently asked questions
The most common causes of overheating in a Dacia Logan MCV are coolant leaks (for example due to a defective water pump or split hose), problems in the cooling system in TCe engines (such as increased oil consumption or timing chain issues) and reduced efficiency of the intercooler. Symptoms include a rapidly rising temperature gauge, an illuminated engine or warning light and visible coolant traces under the car or in the engine bay. You may also notice loss of engine power, rough running or steam coming from under the bonnet. Regularly checking the coolant level and visually inspecting the cooling system helps you to detect these problems at an early stage.
Pull over safely as soon as possible, switch off the engine, set the heater to maximum heat and carefully open the bonnet without opening the radiator cap straight away. After it has cooled down, check the coolant level and see whether you can spot leaks or damaged hoses/pump; do not drive on if the problem is obvious. Have the cooling system (radiator, hoses, water pump) checked by a garage as soon as possible and, for TCe engines, also have the oil consumption and timing chain inspected. Prevent recurrence by checking coolant and oil levels weekly, carrying out maintenance on time and contacting a mechanic immediately in case of unexplained temperature rises.
The repair costs for overheating problems on a Dacia Logan MCV range roughly from a few tens of pounds (for example for hoses, clamps or coolant) to several hundred pounds if the coolant pump, radiator or timing-related parts need to be replaced. Serious engine damage due to prolonged overheating can even run into the thousands of pounds. For the handy DIY enthusiast, visual inspection, tracing and fixing small leaks, replacing hoses/clamps and changing or topping up coolant are all quite feasible jobs. You can also carry out a pressure test on the cooling system yourself and clean or flush the intercooler.
On the Dacia Logan MCV, the coolant pump and potential coolant leaks in particular require extra attention, as they are a major cause of overheating. In TCe engines, increased oil consumption and possible timing chain problems are an indirect weak spot, as they increase the thermal load on the engine. The intercooler and associated hoses can also cause problems in cold or damp conditions, which adversely affects cooling. Regular checks of the pump, hoses, coolant level and any oil consumption problems are therefore recommended.
Prolonged or repeated overheating accelerates wear on internal engine components (such as head gasket, cylinder head and pistons), which can significantly shorten the life of the engine in a Dacia Logan MCV. It can lead to distortion or cracking of the cylinder head, deterioration of gaskets and loss of compression, eventually making expensive overhaul or replacement necessary. In addition, bearings and oil galleries can be damaged, increasing oil consumption and the risk of seizure. In terms of performance this manifests itself as less power, rough running, higher fuel consumption and a greater likelihood of faults.