The cooling system is one of the most vulnerable components in the crossover design Nissan Murano. Over time, plastic radiator tanks lose their tightness, and the honeycombs become clogged with dirt, which leads to engine overheating and critical breakdowns. Owners of second and third generation models are often faced with the need to urgently replace this element, especially after 100 thousand kilometers.
The replacement process is not overly complicated, but requires care and consistency of actions. If you ignore the dismantling rules, you can damage the fragile plastic pipes or break the radiator mounts, which will lead to additional financial costs. A correctly performed procedure will restore cooling efficiency and extend the life of the power unit.
Symptoms of malfunction and system diagnostics
The first signal that Nissan Murano requires attention is the increase in coolant temperature on the dashboard. However, you should not rely only on the sensor, since it can show deviations already at a critical stage. It is better to pay attention to accompanying symptoms that appear long before overheating.
A common sign is the appearance of a sweetish smell of antifreeze under the hood or visible traces of antifreeze leakage on the asphalt after parking. If you notice stains on the ground under the front of the car, immediately check the fluid level in the expansion tank. A sudden drop without visible external drips may indicate an internal leak or evaporation through a crack in the plastic tank.
It is also important to monitor the condition of the cooling fan. If it runs constantly, even in cool weather, this may indicate a fluid circulation problem. Clogged radiator honeycombs do not allow air to pass through them, reducing heat transfer. In this case, the fan tries to compensate for the lack of cooling by working at the limit of its capabilities.
- 🚗 A sharp increase in engine temperature in traffic jams or when driving uphill
- 🔥 Steam appears from under the hood when the engine is running
- 💧 Antifreeze traces on the garage floor or under the front bumper
- 🌡️ Cooling fan runs continuously without pauses
⚠️ Attention: Operation Nissan Murano with a faulty cooling system is strictly prohibited. Overheating can lead to deformation of the cylinder head, which requires expensive engine repairs that significantly exceed the cost of a new radiator.
Selection of original parts and analogues
When purchasing a new radiator, it is important to decide on the brand. Original part from Nissan It has ideal geometry and plastic quality, but is much more expensive than its analogues. However, for modern models such as Murano Z51 or Z52, the original is often the only guaranteed reliable option, since the plastic of cheap analogues can crack within a year.
There are high-quality substitutes on the market from trusted manufacturers, such as Nissens, Behr-Hella or Denso. These brands supply components to the assembly lines of many automakers, so their products are characterized by a high resource. Before purchasing, be sure to check the part number to ensure compatibility with your engine size and transmission type.
It is worth considering that radiators for versions with a diesel engine and a gasoline engine may have a different design and number of sections. Also, don't forget to check the package: some models come with fans and deflectors already installed, making the replacement process easier. Saving on quality here can result in repeated replacement in a short time.
Pay special attention to the condition of the pipes. If you are replacing a radiator, it is highly recommended that you also replace the rubber hoses, as old plastic and rubber lose their elasticity. They often break during dismantling, and searching for new parts during operation can delay repairs. It is better to purchase a set of pipes in advance.
| Manufacturer | Product type | Compatibility | Approximate price |
|---|---|---|---|
| Nissan (Original) | Aluminum with plastic tanks | All Murano generations | High |
| Nissens | High quality analogue | Depends on VIN | Average |
| Behr-Hella | Premium segment | V6 petrol engines | Medium-high |
| Denso | Factory supplier | All models | Average |
- Once a week
- Before every long trip
- Only when the light comes on
- I never check
Preparation for dismantling and necessary tools
Before starting work, you need to prepare a workplace and a set of tools. The vehicle must be parked on a level surface with the handbrake on. The engine must be completely cool to avoid burns when opening the cooling system. It is prohibited to open the expansion tank cap on a hot engine due to high pressure inside the system.
You will need standard tools: a set of ratchet sockets, screwdrivers (Phillips and flathead), pliers and a container to drain the waste fluid. For working in hard-to-reach places Nissan Murano Extensions and cardan shafts are often required. Also, do not forget to prepare a rag and a funnel for pouring new antifreeze.
If you plan to change the radiator yourself, prepare a place to store the removed parts and fasteners. Small bolts and fasteners are easy to lose, so use containers or magnetic stands. Inspect the area under the hood for easy access to the radiator, especially if the vehicle has additional equipment or protection installed.
- 🔧 Set of sockets and wrenches (including extensions)
- 🪣 Container for draining coolant (at least 10 liters)
- 🧤 Gloves and safety glasses
- 🧼 Funnel and clean rags
☑️ Preparing to replace the radiator
Step-by-step instructions for replacing the radiator
Start the process by disconnecting the battery. This is a standard safety procedure that will protect electronic control units from accidental short circuits. Disconnect the negative terminal and move it aside. Then open the hood and remove the decorative plastic trim of the engine if it interferes with access to the upper pipes.
The next step is to drain the coolant. Open the expansion tank cap to relieve pressure in the system. Locate the drain plug on the bottom of the radiator or use the lower hose to disconnect. Place the container and slowly unscrew the cap or loosen the pipe clamp. The liquid will flow out by gravity, so be prepared for a large volume.
After draining the liquid, it is necessary to remove the upper pipes and electrical connectors of the fan. Carefully press out the connector latches and disconnect the wires. Loosen the clamps on the pipes using a screwdriver or pliers and remove them. Be extremely careful as the plastic can become brittle with time and temperature.
Now you can unscrew the mounting bolts holding the radiator in place. Usually there are two on top and two on the bottom, but depending on the model and year of manufacture, the design of the fasteners may differ. Remove the radiator by carefully pulling it up and towards you so as not to damage the honeycomb or plastic bumpers. If the radiator is stuck, check to see if there are any hoses still attached.
Схема действий:1. Снять минусовую клемму АКБ
2. Открыть крышку расширительного бачка
3. Слить ОЖ через нижнюю пробку
4. Отсоединить патрубки и разъемы
5. Открутить крепежные болты
6. Извлечь старый радиатор
⚠️ Attention: When removing the radiator Nissan Murano Monitor the condition of the aluminum fins. Even minor damage to the honeycomb can disrupt airflow and reduce cooling efficiency, even if the new part is intact.
Before installing a new radiator, thoroughly clean the seat from dirt and remnants of old rubber. This will ensure a tight fit and prevent vibration of the part when the engine is running.
Installing a new part and refueling the system
Installing a new radiator is done in the reverse order. Carefully insert the part into the seat, making sure that the lower supports fit correctly into the grooves of the frame. Tighten the mounting bolts, but do not overtighten them to avoid cracking the plastic housing. Install new pipes and tighten the clamps until they stop, ensuring a reliable connection.
After all connections have been assembled, new coolant must be added. Use a quality antifreeze recommended by the manufacturer, such as Nissan Long Life Antifreeze/Coolant. Pour liquid through the expansion tank until it begins to flow out of the neck. Do not top up, leave room for expansion.
To remove air pockets, start the engine and let it idle. Turn on the heater to maximum temperature and the speed of the interior fan so that the fluid circulates through the heater core. Monitor the fluid level in the tank and add it as needed until the level stabilizes and no more air bubbles come out of the system.
- ✅ Check the tightness of all connections after warming up
- 🌡️ Make sure the engine temperature is normal
- 💨 Check the operation of the cooling fan (it should turn on)
- 🚿 Rinse the engine compartment to remove antifreeze residues
How to check for an air lock?
If the heater blows cold air when the engine is warm, and the antifreeze level is normal, most likely there is an air lock in the system. A repeated bleeding cycle or driving up small hills will be required to displace the air.
Common replacement mistakes and how to avoid them
One of the most common mistakes is using low-quality antifreeze or mixing different types of fluids. This can lead to the formation of sediment, which will clog the radiator honeycombs and impair circulation. Always use fluid that meets the manufacturer's specifications and do not mix different colors or brands.
Another mistake is improperly tightening the clamps. Too little tightening will lead to leakage, and too much can cut through the pipe or strip the threads. Use a torque wrench or visually check for tightness to avoid deformation of plastic parts. Also, do not forget to replace old clamps with new ones, as spring clamps lose their elasticity over time.
Ignoring the condition of the fan can also be fatal. If the fan does not turn on or does not work correctly, the new radiator will not be able to effectively cool the engine. Check the functionality of the fan motor before installing a new radiator to avoid a repeat service visit.
⚠️ Attention: Never try to add antifreeze to a hot engine. Sudden temperature changes can lead to cracks in the cylinder head or engine block. Waiting for it to cool completely is a must for safety.
High-quality filling of the system and removal of air pockets is the key to long-term operation of the new radiator. Skipping this step can lead to overheating even with a working part.
Cost of work and feasibility of self-repair
The cost of replacing a radiator in a specialized service depends on the region and car model. On average, the work will cost from 3,000 to 6,000 rubles, not counting the cost of the part itself and consumables. If you have basic repair skills and have the necessary tools, replacing it yourself will save you a significant amount.
However, if you are not confident in your abilities or do not have access to a lift and special tools, it is better to entrust the work to professionals. Installation errors can lead to leaks, overheating and subsequent expensive engine repairs. The service will also conduct a full diagnosis of the system, checking the operation of the thermostat and pump.
Consider purchasing a used radiator if your budget is limited. However, when buying second hand, carefully inspect the honeycombs for damage and check the integrity of the plastic tanks. The resource of a used part may be exhausted, and it will require replacement in a short time, which in the end will be more expensive than buying a new high-quality analogue.
Questions and answers (FAQ)
How much antifreeze is needed for a complete replacement on a Nissan Murano?
Cooling system capacity for most models Nissan Murano is about 8-9 liters. It is recommended to purchase a 10 liter canister to provide a reserve for refilling after removing air pockets.
Is it possible to mix red and green antifreeze?
Absolutely not. Mixing different types of antifreeze can cause a chemical reaction, sedimentation and loss of protective properties. Use only fluid recommended by the manufacturer.
How often does the radiator on a Nissan Murano need to be replaced?
The radiator itself does not have strict replacement regulations and serves until damage occurs. However, it is recommended to check its condition every 50,000 km, especially if the car is operated in dusty and dirty conditions.
What to do if the radiator is leaking but there are no cracks?
Sometimes a leak occurs due to corrosion of aluminum honeycombs or a leak in the joint between plastic and aluminum. In such cases, repair is often ineffective and complete replacement of the part is recommended.
Do I need to change the thermostat when replacing the radiator?
It is recommended to check the condition of the thermostat. If it is not working correctly (jammed), replacing it along with the radiator will save time and money in the future, since it may be difficult to access.