The cooling system is a vital component for any car, and Nissan Murano is no exception. Operating a crossover in conditions of changeable climate, frequent city and highway driving creates a high load on the thermostatic elements. If you notice that the engine temperature gauge is creeping up or a puddle of antifreeze has formed under the car, the problem most likely lies in the radiator.
Ignoring signs of overheating can lead to catastrophic consequences: deformation of the cylinder head, destruction of the cylinder head gasket and expensive engine overhaul. Radiator replacement is a procedure that can be performed independently if you have the tools and time, but it requires care and adherence to the sequence of actions. In this article we will analyze all the nuances of choosing spare parts, diagnosing faults and correct installation.
Symptoms of malfunction and diagnostics of the cooling system
You can determine that the radiator requires replacement not only by an obvious coolant leak. Often problems manifest themselves in the operation of the interior heater or a change in the color of the liquid in the expansion tank. Low heating efficiency interior in winter when the engine is warm often indicates that the cooling system does not circulate coolant properly due to clogging of the radiator honeycomb or internal corrosion.
A visual inspection of the engine compartment can reveal microcracks in plastic tanks, which are a weak point of the structure Nissan Murano. Over time, the plastic ages, becomes brittle and becomes covered with a network of cracks, especially in the areas adjacent to the aluminum cores. It is also worth paying attention to oil stains, which may indicate damage to the automatic transmission heat exchanger built into the radiator.
- ๐ด Constant need to top up antifreeze without visible external drips.
- ๐ด The appearance of an oil emulsion on the expansion tank cap or on the oil dipstick.
- ๐ด The cooling fan operates at maximum power even in cool weather.
If you notice one of the listed signs, do not delay diagnosis. Timely identification of the problem will save you significant money on engine repairs. Thermostat and the pump can also cause overheating, so before purchasing a new radiator, it is recommended to conduct a comprehensive check of the entire system.
โ ๏ธ Attention: Do not try to add water to an overheated engine! A sharp temperature change can lead to instant deformation of aluminum parts and cracks in the cylinder block. Allow the engine to cool naturally.
Choosing a new spare part: original or analogue?
The auto parts market offers a wide range of radiators for Nissan Murano different generations (Z50, Z51, Z52). Original parts from the manufacturer undoubtedly have the best build quality and precise geometric dimensions. However, their cost is often overpriced, which makes the purchase unjustified if you have a limited budget.
Many crossover owners successfully switch to high-quality analogues from trusted brands. Companies like Nissens, Denso, Behr-Hella or Cherri produce radiators that often surpass the original in the quality of aluminum used and soldering density. The main condition is to carefully check the article number and compatibility with your year of manufacture and engine size (for example, 3.5 V6).
- ๐น Original: Ideal geometry, guaranteed compatibility, but high price and risk of counterfeit.
- ๐น High-quality analogue: Optimal price-quality ratio, availability in warehouses.
- ๐น Budget options: They often have a simplified design of plastic tanks and are prone to cracks.
When choosing, pay attention to the presence of additional elements in the kit. Some radiator models are already equipped with temperature sensors and plugs, which simplifies the installation process. Aluminum honeycomb must be smooth, without dents or signs of corrosion. Plastic tanks should not have any foreign odors or visible casting defects.
- Original (Nissan)
- High-quality analogue (Denso/Nissens)
- Budget option
- I buy used
Preparation for work and necessary tools
Before starting work, it is necessary to prepare the workplace and tools. The process of replacing the radiator with Nissan Murano requires access to the bottom of the car, so a lift or inspection hole will be indispensable. If you don't have access to service equipment, you can use sturdy supports and a jack, but this will require more care.
You will need a set of wrenches and sockets, including extensions and universal joints, as some of the mounting bolts are in hard to reach places. Do not forget to prepare a container for draining old antifreeze with a volume of at least 10 liters, since the crossover cooling system is spacious. You will also need new clamps, since old ones often stick and break when removed.
โ๏ธ Preparing to replace the radiator
Be sure to have rags, gloves and personal protective equipment. Antifreeze is toxic and has a pungent odor, so you should work in a ventilated area. Coolant must be disposed of in accordance with environmental regulations and not poured down the drain or onto the ground.
What to do if there is no hole?
If you don't have access to a pit or lift, you can try to do the work on level ground, using long extensions and flathead screwdrivers to pry up the pipes. However, this will significantly complicate the process and take more time.
Step-by-step instructions for dismantling the old unit
The first step is to drain the coolant. Open the hood, locate the expansion tank and loosen the pressure release plug. Then lift the car and find the drain plug on the radiator or remove the lower pipe by replacing the container. Wait until the system is completely empty.
Next, you need to remove the upper protective casing and disconnect the electrical connectors from the cooling fan and sensors. Unscrew the fastenings of the pipes that connect the radiator to the engine and expansion tank. Be prepared for the fact that some of the liquid may spill out when disconnecting the hoses, so use a rag.
- ๐ง Use
key for 10or12for unscrewing the bolts securing the radiator to the body. - ๐ง Carefully disconnect the pipes using pliers to compress the clamps.
- ๐ง Remove the fan assembly if its design does not allow it to be left in place.
After disconnecting all connections, carefully remove the old radiator. This must be done carefully so as not to damage neighboring elements, such as the air conditioner condenser or bumper. Plastic tanks may be fragile, so avoid sudden movements or impacts.
โ ๏ธ Attention: The air conditioner condenser is located in front of the radiator and bends very easily. Never use a pry bar between the radiator and condenser when removing a part!
If the fan remains on the old radiator, it must be carefully moved to the new one. Check the condition of the rubber mounting pads; they should provide rigid fixation without vibration. If necessary, replace them with new ones to avoid unnecessary noise when the engine is running.
Installing a new radiator and refueling the system
Installing a new radiator occurs in the reverse order. First, install it in its original places, securing it with bolts, but do not tighten them all the way so that you can adjust the position a little. Make sure that the lower guides fit neatly into the grooves on the body brackets.
Connect all pipes and secure them with new clamps. Be sure to check the tightness of the sealing rings. Connect the electrical connectors for the fan and sensors, making sure the clips snap fully into place. Tightening the clamps must be uniform to avoid skewing of the pipes and subsequent leakage.
After installing all components, you can begin refueling the system. Fill the expansion tank with fresh antifreeze to the mark MAX. Start the engine and let it idle. Turn the heater on to maximum temperature and fan speed to circulate fluid through the heater core.
Before starting the engine, check that the expansion tank cap is tightly closed and all pipes are securely fastened. This will prevent hot fluid from escaping under pressure.
During the warm-up process, monitor the engine temperature and fluid level. If the level drops, add antifreeze. When the engine reaches operating temperature and the thermostat opens, the level in the reservoir may drop - this is normal. Add fluid to the correct level after the engine has cooled.
Checking the quality of work and eliminating smudges
After completing the work, you must carefully check the system for leaks. Inspect all pipe connections, drain plugs and the radiator itself. It is best to do this after several engine warm-up and cool-down cycles, when the system experiences pressure changes.
Pay attention to the operation of the cooling fan. It should turn on when a certain temperature is reached and turn off after cooling. If the fan doesn't turn on or runs constantly, there may be a sensor or wiring problem that needs to be fixed.
| Verification phase | What to pay attention to | Action when ๅ็ฐ้ฎ้ข |
|---|---|---|
| Visual inspection | Presence of antifreeze drops on connections | Tighten clamps or replace pipes |
| Pressure check | Maintaining pressure in the system when cooling | Replace the reservoir cap or find a hidden leak |
| Stove operation | Outlet air temperature | Check for air pockets |
| Electronics | Turning on the fan | Check sensors and fuses |
If you notice small smudges, do not immediately disassemble everything again. Sometimes just tightening the clamp a few millimeters is enough. However, if the leak is severe, it is better to play it safe and check the tightness of the connections again. System tightness - the key to long engine operation.
A high-quality radiator replacement includes not only installing a new part, but also completely bleeding the cooling system to remove air pockets.
Common mistakes and how to avoid them
Many owners Nissan Murano make typical mistakes when replacing a radiator, which lead to repeated breakdowns. One of the most common problems is the use of old antifreeze, which has already lost its properties. Mixing different types of coolants can cause sediment to form and clog the passages.
Another mistake is incorrect installation of pipes. If the hose is inserted crookedly or not completely, this will lead to rapid depressurization under pressure. Also, you should not skimp on clamps, as cheap products may not provide the required clamping and may burst when heated.
- โ Mixing antifreeze of different colors and compositions.
- โ Ignoring the replacement of o-rings and gaskets.
- โ Insufficient pumping of the system leading to overheating.
Carefully read the operating instructions for your vehicle before starting work. Some models Nissan Murano have design features that require the removal of additional elements to access the radiator. Accuracy of action and adherence to technology is the key to success.
What antifreeze is best to use?
For Nissan Murano It is recommended to use genuine Nissan Long Life Antifreeze/Coolant (usually green or blue). If the original is not available, you can use high-quality analogues marked G12++ or G13, but be sure to check compatibility with the materials of the cooling system.
Is it possible to drive without a radiator?
Absolutely not. Driving without a radiator or with a faulty cooling system will lead to instant overheating of the engine, which may result in its complete failure. Even a short trip to the service must be done on a tow truck.
How often should the radiator be replaced?
The radiator itself is a durable unit and can last the entire life of the car, subject to proper operation and timely replacement of antifreeze. However, plastic tanks may require replacement after 7-10 years due to aging of the material.
What to do if the engine boils?
Immediately stop in a safe place, turn on your hazard lights and open the hood for ventilation. Do not open the radiator cap on a hot engine! Wait until it cools down completely, check the fluid level and only then continue driving or call a tow truck.
Do I need to change the fan when replacing the radiator?
If the fan is working properly and has no mechanical damage, it can be left. However, if it is noisy or works intermittently, it is better to replace it immediately, since access to it after installing a new radiator will be difficult.
Regularly checking the coolant level and quality is the best way to prevent the need for an urgent radiator replacement on the road.