Cooling system on a hybrid crossover Nissan Note e-Power radically different from conventional internal combustion engines. Here you are dealing not with one circuit, but with an extensive network, where heat from the gasoline generator, inverter and electric motor must be removed with maximum efficiency. Ignoring maintenance regulations or using the wrong fluid can lead to overheating of the power plant and expensive electronic repairs.

Many owners make the mistake of trying to replace antifreeze in the same way as on conventional cars. In a hybrid architecture Nissan Note It is critical to observe the temperature regime and the sequence of actions when bleeding air. Errors in bleeding the system lead to air pockets that can melt hoses and damage the battery cooling pumps.

Features of the hybrid dual-circuit cooling system

Main difference Nissan Note e-Power — the presence of two independent but interconnected cooling circuits. The first circuit is responsible for the gasoline engine-generator, which operates in auxiliary power station mode. The second circuit serves the power electronics, inverter and traction battery. These systems often have different types of refrigerant and different charging points.

It is important to understand that even when the engine is stopped, the system may be under pressure due to residual heat or the operation of electric pumps. Electronic pumps battery cooling can be activated automatically if the sensors detect an increase in temperature, even if the key is removed from the ignition switch. This requires special care when unscrewing the expansion tank caps.

The coolant in Nissan hybrids often has a specific color, usually a purple or green tint, indicating the presence of organic additives (OAT). Mixing different types of antifreeze is unacceptable, as this causes sedimentation and corrosion. aluminum radiators. Always check the specifications in the service book before purchasing consumables.

⚠️ Attention: Never open the radiator or expansion tank cap on a hot engine. In a hybrid system, pressure can be maintained longer than in conventional cars due to the operation of electric pumps, which will lead to burns from steam and boiling water.

Choosing the right coolant for e-Power

For correct operation of the cooling system Nissan Note It is necessary to use original Nissan Long Life Coolant (LLC) or its full equivalent that meets the specifications KL23-99-310. Cheap substitutes labeled "Universal" may not provide the necessary protection against galvanic corrosion to which inverter contacts are susceptible.

When choosing a liquid, pay attention to the freezing point. For our climatic conditions, the best option would be a mixture with a crystallization temperature of -40°C or -35°C. You should not dilute the concentrate with distilled water yourself; if you are not sure of the accuracy of the proportions, it is better to purchase a ready-made solution.

  • ✅ Original Nissan LLC — purple color, guaranteed compatibility with all units.
  • ✅ Full analogues from Prestone or CoolStream brands - subject to OAT marking and compliance with standards.
  • ❌ The use of red or blue antifreeze (G11/G12) is strictly prohibited; they destroy gaskets and seals.

Cooling system volume for Nissan Note e-Power varies depending on the year of manufacture, but is usually about 5-6 liters for a full replacement cycle. A supply of fluid should always be in the trunk, as consumption may increase if there are microcracks in the hoses.

⚠️ Warning: Using antifreeze that does not meet Nissan specifications may cause the O-rings in the electric pumps to deteriorate, causing leakage into the inverter and electronic failure.

Step-by-step procedure for replacing and bleeding the system

The replacement process begins with preparing the car. Install Nissan Note on a flat surface, apply the handbrake and open the hood. The engine must cool completely, the engine temperature should not exceed 30-40 degrees Celsius. This is critical to the safety and accuracy of the drain.

Locate the drain plugs on the radiator and engine block. Place a container under the drain hole, unscrew the plug and allow the liquid to drain completely. Don't forget to also drain the old fluid from the expansion tank by disconnecting the lower hose or carefully pumping it out with a blower.

☑️ Preparing to replace antifreeze

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After draining, tighten the radiator and block plugs, but do not overtighten them so as not to strip the threads. Start filling the system through the expansion tank neck. Fill the fluid slowly to avoid the formation of air pockets inside the lines. The level should reach the MAX mark.

Next comes the most important stage - pumping. Start the engine and let it idle. Turn on the stove to maximum temperature and maximum fan speed. This is necessary to open the thermostat and allow fluid to flow through the interior heater core, displacing air.

Monitor the fluid level in the expansion tank. It will drop as air escapes and the system fills. Periodically add new antifreeze, maintaining the level between MIN and MAX. The process may take 15-20 minutes until the radiator fan turns on at full power.

What to do if air does not come out?|If after a long warm-up the level does not stabilize and bubbles continue to appear, it is possible that the air lock is stuck in a high section of the circuit. Try gently lifting the front of the car or rocking it slightly on a level surface to dislodge the plug. As a last resort, unscrew the fitting on the highest pipe (if provided by the design) to bleed air.-->

When the engine reaches operating temperature and the radiator fan starts, turn off the engine and let it cool. Check the fluid level again and top up if necessary. Make sure there are no leaks at connections or plugs.