Replacing antifreeze on a Nissan Almera G15: a complete guide with photos and videos

Replacing antifreeze in Nissan Almera G15 - a procedure that many owners put off until the last minute, until the engine begins to overheat or the stove blows cold air. Meanwhile, the coolant loses its properties after 3-5 years of operation (or 60-90 thousand kilometers), and its timely replacement prevents radiator corrosion, scale formation and pump failure.

In this article you will find step by step instructions with photos and videos, current recommendations for choosing antifreeze for Almera G15 (including original articles and analogues), as well as answers to frequently asked questions: how many liters to fill, how to properly drain old fluid, and whether the system needs to be flushed. We will also look into unique nuances of this model, for example, why the coolant light may come on after replacement and how to fix it.

When to change antifreeze on a Nissan Almera G15: signs and regulations

The manufacturer recommends replacing antifreeze with Nissan Almera G15 every 90,000 km or 6 years (whichever comes first). However, these terms are relevant for original fluid Nissan L255N (green color). If you use analogues or operate the car in difficult conditions (frequent traffic jams, high temperatures, dusty roads), the interval is reduced to 60,000 km or 3-4 years.

Do not wait until the deadline if you notice at least one of these signs:

• 🔥 Engine overheating — the temperature arrow on the dashboard rises above the middle, the cooling fan runs constantly.
• 💧 Antifreeze leaks - puddles under the car (usually under the radiator or pump), a sharp decrease in the level in the expansion tank.
• 🌀 Change in color or consistency — the fluid has become rusty, cloudy or flocculated (a sign of corrosion or mixing of incompatible types of antifreeze).
• ❄️ The stove blows cold air — the heater radiator channels are clogged or the thermostat is stuck in the open position.

⚠️ Attention: If antifreeze is in Almera G15 turns brown or black, this is a signal of the destruction of additives and active corrosion inside the system. In this case, it is necessary not only to replace the fluid, but also flushing the system with special compounds (For example, LIQUI MOLY Kuhler-Reiniger).

Check the antifreeze level in the expansion tank: it should be between the marks MIN And MAX. If the fluid drains faster than usual, look for leaks in the pipe connections, radiator, or pump gasket. On Almera G15 A common problem is cracks in the plastic tank or leakage through the lid (original article number - 21450-4M000).

What antifreeze to fill in Nissan Almera G15: original and analogues

B Nissan Almera G15 filled from the factory green antifreeze standard Nissan L255N (article - KE902-99932). This is a hybrid liquid (class G11), compatible with aluminum and copper cooling system components. Important: do not mix it with red or blue antifreeze (For example, G12 or G13), as this will lead to sedimentation and clogging of the channels.

If original antifreeze is difficult to find, choose approved analogues Nissan or corresponding specifications JIS K 2234. The table below shows the tested options:

Manufacturer	Article	Color	Volume (l)	Notes
Nissan (original)	KE902-99932	Green	1	Concentrate, diluted with distilled water 1:1
Coolstream (Russia)	NRC	Green	1 or 5	Ready to pour, compliant G11
Sintec (Russia)	ANTIFREEZE G11	Green	1, 5 or 10	Budget option, suitable for washing
Ravenol (Germany)	HJC Hybrid Japanese Coolant	Green	1,5	Premium composition, compatible with Nissan L255N

To completely replace antifreeze in Almera G15 will be required 6.5–7 liters finished liquid (if you flush the system). Enough without rinsing 5–5.5 liters. Buy antifreeze with a reserve, as some will be needed to be topped up after replacement (when the engine warms up, the level may drop).

⚠️ Attention: Do not use antifreeze grades G12+ or G13 (red, purple) - they are incompatible with the original liquid Nissan and may cause corrosion of aluminum parts. Also avoid cheap fakes without certificates: they often contain aggressive additives that destroy rubber pipes.

If you decide to save money and buy concentrate, dilute it only distilled water in a 1:1 ratio (for regions with frosts down to -35°C). In southern regions it can be diluted 2:1 (antifreeze:water), but this will reduce the freezing point to -20°C.

Preparing for replacement: tools and safety precautions

To replace antifreeze yourself with Nissan Almera G15 you will need:

• 🔧 Tools: 10 mm wrench (for radiator drain plug), screwdriver (for pipe clamps), pliers, funnel.
• 🧤 Protection: rubber gloves (antifreeze is toxic!), glasses, rags.
• 📦 Consumables: new antifreeze (7 l), distilled water (5 l for flushing), sealant for pipes (for example, ABRO 11-AB).
• 🔋 Additionally: drain container (with a volume of at least 8 liters), a jack (if you need to remove the engine protection).

Before starting work necessarily:

1. Allow the engine to cool (the antifreeze temperature must be below 50°C, otherwise you risk getting burned!).
2. Place the car on a level surface (or with a slight slope forward for better drainage).
3. Remove the negative terminal from the battery to avoid a short circuit if liquid gets into the wiring.

⚠️ Attention: On Almera G15 The radiator drain plug is plastic and breaks easily with excessive force. If it is stuck, do not try to unscrew it by force - it is better to carefully cut off part of the plug with a knife and replace it with a new one (part number - 21410-4M000).

If you plan to flush the system, prepare 2 buckets: one for draining old antifreeze, the second for flushing water. Do not pour the liquid onto the ground: antifreeze is toxic to animals and plants. Dispose of it at special collection points or take it to a car service center.

Is the terminal removed from the battery|Is the engine cool (temperature below 50°C)|Is there a container for draining (volume ≥8 l)|Are new clamps for the pipes prepared|Is the cap of the expansion tank closed (so as not to create a vacuum)-->

Step-by-step instructions: how to drain old antifreeze

Draining antifreeze onto Nissan Almera G15 has nuances due to the design of the cooling system. Follow the instructions to avoid leaving air pockets:

1. Remove the engine protection (if it interferes with access to the radiator). On Almera G15 It is secured with 4 10 mm socket head bolts.
2. Open the expansion tank cap - this will reduce the pressure in the system and speed up the drainage.
3. Place a container under the radiator and unscrew the drain plug (it is located at the bottom of the radiator on the right side). On some versions Almera G15 the plug may be hidden by a plastic casing - it must be carefully bent.
4. Drain the fluid from the cylinder block. To do this, find the drain bolt on the block (next to the oil filter) and unscrew it with a 10 mm wrench. Be careful: antifreeze flows out of this hole under pressure!
5. Bleed the system, pressing on the upper radiator hose to expel any remaining fluid.

On Almera G15 remains in the system about 1–1.5 liters of antifreeze, which does not drain by gravity. To remove it completely, you can:

• 🔄 Blow out the system compressed air (through the radiator filler neck).
• 🚗 Start the engine for 10–15 seconds (after tightening the drain plugs and adding water), and then drain the liquid again.

After draining, inspect the old antifreeze:

• 🟢 Green without impurities — the system is normal, you can fill in a new one.
• 🟤 Brown or rusty - washing required.
• ⚫ Black with flakes — critical condition, deep cleaning is needed (possibly with disassembling the radiator).

What to do if the drain plug is broken?

If the plastic radiator cap is cracked or the threads are broken, you can temporarily drain the antifreeze through the lower pipe by loosening the clamp. After replacing the fluid, install a new plug (part number 21410-4M000) or use a universal metal one (for example, from VALEO).

Flushing the cooling system: is it necessary and how to do it

Flushing the cooling system Nissan Almera G15 mandatory in three cases:

1. If the drained antifreeze is dirty, with sediment or rust.
2. If you do not know what fluid was previously filled (for example, you are buying a used car).
3. If different types of antifreeze were mixed (for example, green and red).

For rinsing use special compounds (For example, LIQUI MOLY Kuhler-Reiniger or Wynn’s Radiator Flush), but you can get by with distilled water. Washing algorithm:

1. Tighten the drain plugs and fill the flushing fluid (or water) into the expansion tank to the mark MAX.
2. Start the engine and let it idle for 10-15 minutes (until the thermostat opens).
3. Drain the flushing fluid and evaluate its condition. If the water coming out is dirty, repeat the procedure.
4. Blow the system with air (through the filler neck) to remove any remaining moisture.

⚠️ Attention: Do not use regular tap water for rinsing - it contains salts and impurities that form scale. Also avoid harsh products (such as vinegar or citric acid): they can damage rubber pipes and aluminum parts.

On Almera G15 After washing, air pockets often remain, which lead to overheating. To avoid them:

• 🔝 Pour antifreeze in a thin stream, directing it to the side wall of the tank (this will reduce foaming).
• 🚗 After filling, warm up the engine with the tank lid open, periodically squeezing the pipes.

Filling with new antifreeze: procedure and nuances

Now we move on to pouring fresh antifreeze. On Nissan Almera G15 this is done in several stages:

1. Tighten the drain plugs (radiator and cylinder block). Check them for leaks - if the plugs are old, replace the O-rings.
2. Pour antifreeze into the expansion tank to the mark MAX. Use a funnel to avoid spillage.
3. Start the engine and let it idle for 5-7 minutes. Monitor the fluid level - it may drop (add as needed).
4. Warm up the car to operating temperature (the sensor arrow should reach the middle). This will open the thermostat and allow antifreeze to circulate in a large circle.
5. Check the operation of the stove - if hot air blows, the system is filled correctly.

After the engine has cooled (after 1–2 hours), check the antifreeze level again and add if necessary. On Almera G15 normal level - 1–1.5 cm above the mark MIN.

If after replacement the coolant light on the dashboard comes on, the reasons may be the following:

• 💡 Low antifreeze level - add liquid to normal level.
• 🔧 Level sensor faulty (article - 25260-4M000).
• 🌀 Air lock - eliminate it as described above.

Common mistakes when replacing antifreeze on a Nissan Almera G15

Even experienced car owners make mistakes when replacing coolant. Here are the most common ones on Almera G15:

• 🔴 Mixing different types of antifreeze. For example, adding red G12 to green G11 leads to the formation of a gel that clogs the radiator.
• 🔴 Ignoring flushing when switching to another type of liquid. Remains of old antifreeze may react with new one.
• 🔴 Tightening the pipe clamps. On Almera G15 Plastic radiator fittings are fragile - excessive force leads to cracks.
• 🔴 They forget to bleed the system after filling, which causes air pockets to form.
• 🔴 Use tap water to dilute the concentrate, which leads to scale.

Another typical problem is antifreeze leak after replacement. If after a day or two puddles appear under the car again, check:

• 🔍 Expansion tank cap - it must be tightly screwed (original article number - 21450-4M000).
• 🔍 Pipes and clamps - especially at the connection points with the radiator and pump.
• 🔍 pump - on Almera G15 its oil seal often starts to leak after 100,000 km.

If the leak cannot be found visually, add antifreeze fluorescent additive (For example, UV Leak Detector) and illuminate the system with an ultraviolet lamp - the leak will glow green.

FAQ: answers to frequently asked questions

How much antifreeze is needed for a complete replacement on a Nissan Almera G15?

For Almera G15 with engine HR16DE (1.6 L) required 6.5–7 liters ready-made antifreeze (including flushing). Without flushing, 5–5.5 liters will be enough. Always buy fluid with a reserve, as some will be used for topping up after the engine warms up.

Is it possible to mix Nissan L255N antifreeze with analogues?

Yes, but only with antifreeze of the same standard (G11, green) and with approval Nissan. For example, Coolstream NRC or Ravenol HJC. Do not mix with G12 (red) or G13 (purple) - this will lead to sedimentation and clogged channels.

Why does the heater blow cold air after replacing the antifreeze?

This is a sign air lock in the system. To fix it:

1. Stop the engine and let it cool.
2. Open the expansion tank cap and squeeze the upper radiator hose several times.
3. Add antifreeze to the level and warm up the engine again.

If this does not help, check the functionality of the thermostat (on Almera G15 it often jams).

What is the freezing point of original Nissan L255N antifreeze?

Original concentrate Nissan L255N when diluted 1:1 with distilled water provides protection up to -35°C. If diluted 2:1 (antifreeze:water), the freezing point will drop to -20°C.

Do I need to change the thermostat when replacing antifreeze?

It is not necessary to replace the thermostat during a scheduled antifreeze change. However, on Almera G15 after 100,000 km it often begins to jam (especially if low-quality fluid was used). Signs of malfunction:

• The engine takes a long time to warm up.
• The temperature arrow fluctuates or shows overheating.
• The stove blows either hot or cold air.

Article number of the original thermostat - 21200-4M000.