How to properly drain antifreeze from a <em>Nissan Almera N16</em>: instructions with photos and nuances

Nissan Almera N16 is a popular sedan that, with proper care, can last for years. One of the key maintenance procedures is replacing the coolant. But before you fill in new antifreeze, you need to properly drain the old one. In this article we will look at how to do this yourself without damaging the cooling system or violating environmental standards.

Many car owners mistakenly believe that draining antifreeze is a simple operation that does not require preparation. However, on Almera N16 (especially with engines QG15DE And QG18DE) has its own characteristics: inconvenient location of drain plugs, the risk of air getting into the system and the need for flushing when changing the type of liquid. We'll tell you how to avoid common mistakes and get the job done right the first time.

Why is it important to properly drain antifreeze onto Nissan Almera N16

Coolant in Almera N16 circulates not only through the radiator, but also through the engine block, heater and thermostat. If you drain it incorrectly, pockets of old fluid will remain in the system, which will mix with the new one and reduce its protective properties. In addition, air locks can lead to engine overheating or poor heater performance.

Another problem is corrosion. Oxidation products accumulate in the old fluid, which settle on the walls of the channels. If you do not flush the system before adding new antifreeze, these deposits will accelerate wear on the pump and radiator. On Almera N16 with a mileage of more than 100 thousand km, this is especially important, since aluminum parts of the cooling system are more susceptible to erosion.

• 🔧 Consequences of incomplete drainage: decreased cooling efficiency, risk of overheating, corrosion of metal parts.
• ♻️ Environmental aspect: Antifreeze is toxic - it should not be poured onto the ground or down the drain. Use special containers for disposal.
• ⚠️ Health Risk: Ethylene glycol vapor (the base of most antifreeze) is poisonous. Work in a ventilated area.

On Nissan Almera N16 With an automatic transmission, draining antifreeze requires additional care: part of the fluid circulates through the automatic transmission heat exchanger. If it is not washed, the new antifreeze will quickly lose its properties.

Preparing to drain antifreeze: tools and materials

Before you get started, make sure you have everything you need. For Almera N16 Specific tools will be required, since access to the drain plugs is difficult.

Main list:

• 🔨 Keys and heads: spanner for 10 mm (for radiator drain plug), head on 14 mm (for the cylinder block plug), extension and ratchet handle.
• 🛢️ Capacities: a plastic basin or bucket with a volume of at least 8 liters (the total volume of the system is ~6.5 liters), a funnel for filling.
• 🧤 Protective equipment: rubber gloves, glasses, rags. Antifreeze is aggressive to leather and paint.
• 🧼 For washing: distilled water (10–15 l) or a special cooling system cleaner (for example, LIQUI MOLY Kuhler-Reiniger).

Also prepare new antifreeze. For Nissan Almera N16 Suitable ethylene glycol based fluids with specification Nissan Coolant L248 (green) or analogues: CoolStream A-110, Sintec Unlimited. Volume - 6–7 liters.

Tool/material	Purpose	Note
Key on 10 mm	Radiator drain plug	On some models the plug is plastic - do not use excessive force.
Head on 14 mm	Cylinder block drain plug	An extension cord is required - the plug is located in an inconvenient place.
Distilled water	Flushing the system	Do not use tap water - it contains salts that form scale.
New antifreeze	Replacing old fluid	For Almera N16 A concentrate diluted 1:1 with water is optimal.

⚠️ Attention: If your Almera N16 equipped with air conditioning, draining the antifreeze may require removing the crankcase protection. On models with QG18DE The cylinder block plug sometimes gets stuck - do not try to unscrew it by force, first treat it with a penetrating lubricant (for example, WD-40).

Step-by-step instructions: how to drain antifreeze from Nissan Almera N16

It is better to carry out the procedure on a cold engine - this way you will avoid burns and reduce the pressure in the system. If the engine is hot, wait at least 2 hours.

Step 1. Preparing the car

• 🚗 Place the car on a flat surface (preferably on an inspection hole or overpass).
• 🔧 Remove the crankcase protection (if equipped). On Almera N16 it is secured with 4–6 bolts on 10 mm.
• 🛠️ Place a container under the radiator drain plug (bottom right).

Step 2: Drain the radiator

1. Open the cap of the expansion tank - this will reduce the pressure in the system.
2. Carefully unscrew the radiator drain plug using a key 10 mm. The liquid will begin to flow out - take your time, let it drain completely (about 3-4 liters).
3. If the plug is plastic, use pliers, but do not squeeze it too hard.

Step 3. Draining antifreeze from the cylinder block

This is the most difficult stage, since the plug is located behind the starter (on engines QG15DE/QG18DE).

• 🔩 Use the head on 14 mm with extension cord. The plug is located on the left side of the block (in the direction of travel).
• 🕳️ Place the container under the engine - another ~2 liters of liquid will flow out.
• ⏳ Let the antifreeze drain for at least 10–15 minutes. To speed up the process, you can rock the car slightly.

The engine has cooled down (temperature below 40°C)|The crankcase protection has been removed (if any)|A drain container has been prepared (volume ≥8 l)|The expansion tank cap is open|Tools at hand (10 and 14 mm wrenches)-->

Step 4: Flush the system (optional)

If the antifreeze is cloudy, with flakes or rust, the system needs to be flushed. To do this:

1. Tighten the drain plugs.
2. Pour distilled water (or flushing fluid) through the expansion tank.
3. Start the engine and let it idle for 10–15 minutes.
4. Drain the water and repeat the process 2-3 times until it comes out clean.

⚠️ Attention: On Almera N16 With an automatic transmission, when flushing the cooling system, you cannot use aggressive chemical compounds - they can damage the automatic transmission heat exchanger. Use only distilled water or specialized rinses (e.g. LAVR Radiator Flush Classic).

Typical mistakes when draining antifreeze and how to avoid them

Even experienced car owners sometimes make mistakes that lead to problems with the cooling system. Let's look at the most common of them using an example Nissan Almera N16.

1. Incomplete drainage of liquid

If you do not drain the antifreeze from the cylinder block, up to 1–1.5 liters of old fluid will remain in the system. This will lead to:

• ⚠️ Reducing the boiling point of the new liquid (due to mixing with waste).
• 🔥 Risk of formation of corrosion pockets.
• 🌡️ Incorrect operation of the temperature sensor.

How to avoid: Always drain fluid from both points (radiator and block) and flush the system.

2. Using the wrong antifreeze

B Almera N16 Do not use silicate-based antifreezes (for example, G11) - they are incompatible with aluminum engine parts. Optimal choice:

• 🟢 Nissan Coolant L248 (green, ethylene glycol).
• 🔵 CoolStream A-110 or Sintec Unlimited (carboxylate).

3. They forget about air jams

After adding new antifreeze, air bubbles may remain in the system, blocking circulation. Signs:

• 🌡️ The engine overheats quickly.
• 🔥 The stove blows cold air.
• 🚗 The temperature needle is jumping.

How to fix: After adding antifreeze, remove the hose from the throttle body (on QG18DE - upper pipe) and wait until liquid comes out of it without bubbles.

How to fill in new antifreeze: nuances for Nissan Almera N16

After draining the old fluid and washing it, you can start filling in the new one. This also has its own characteristics.

1. Liquid preparation

If you use concentrate, dilute it with distilled water in a 1:1 ratio (for climates with frosts down to -35°C). For Almera N16 The optimal volume is 6.5 liters of ready-made antifreeze.

2. Filling order

• 🔧 Tighten the drain plugs (tightening torque: radiator - 1.5 Nm, block - 2.5 Nm).
• 🚗 Fill the expansion tank with antifreeze to the mark MAX.
• 🔄 Start the engine, let it run for 3-5 minutes at idle speed.
• 🔥 Wait until the cooling fan turns on and add liquid to the level.

3. System check

After filling:

• 🔍 Inspect the pipes for leaks.
• 🌡️ Make sure the temperature gauge is stable (on a warm engine - in the middle of the scale).
• 🚗 Check the operation of the stove - it should blow hot air.

What should I do if the engine overheats after replacing the antifreeze?

If the temperature arrow rises above normal, possible reasons:

1. Air lock — bleed the air through the throttle body pipe.

2. Faulty thermostat — check whether it opens when heated (the upper and lower radiator pipes should be hot to the touch).

3. Clogged radiator — wash it outside (with a jet of water under pressure) or replace it.

4. Wrong antifreeze - drain and fill with the recommended one (for example, Nissan Coolant L248).

Disposal of old antifreeze: rules and tips

Antifreeze is a hazardous waste that should not be poured onto the ground or down a drain. It contains ethylene glycol and additives that are toxic to people and animals.

How to dispose:

• ♻️ Take it to a hazardous waste collection point (most cities have special sites).
• 🏭 Some service stations accept used antifreeze for a nominal fee.
• 🚮 If the volume is small, you can neutralize the liquid with slaked lime (1 kg per 10 liters of antifreeze), and then dispose of it as household waste.

What not to do:

• ❌ Pour into rivers, lakes or on the side of the road.
• ❌ Use for washing parts or tools.
• ❌ Store in an open container - ethylene glycol vapors are poisonous.

⚠️ Attention: If you accidentally spill antifreeze on asphalt, cover it with sand or sawdust, then collect it in a sealed bag and dispose of it. Ethylene glycol has a sweetish odor that attracts animals—even small amounts can be deadly to dogs or cats.

Frequently asked questions (FAQ)

Is it possible to drain antifreeze on a hot engine?

No. On Nissan Almera N16 The cooling system is under pressure, and when the plug is opened, hot liquid can escape under pressure, which will lead to burns. Always wait until the engine has cooled down (temperature below 40°C).

How much antifreeze is in the cooling system Almera N16?

The total volume is about 6.5 liters. However, when replacing without flushing, approximately 5–5.5 liters are drained (some remains in the block and pipes).

What kind of antifreeze to pour into Nissan Almera N16 with engine QG18DE?

Optimal choice - Nissan Coolant L248 (green, ethylene glycol) or its analogs: CoolStream A-110, Sintec Unlimited. Do not use antifreeze class G11 (silicate) - they are incompatible with the aluminum parts of this engine.

What to do if after replacing the antifreeze the stove does not heat?

Most likely there is air left in the system. To set him off:

1. Start the engine and let it run for 5-10 minutes.
2. Remove the hose from the throttle body (upper pipe on QG18DE).
3. Wait until antifreeze comes out of it without bubbles, and put the hose back on.
4. Add fluid to the level MAX.

Do I need to flush the cooling system when replacing antifreeze?

If the old fluid is clean and changed on time (every 2-3 years), flushing is not necessary. However, if the antifreeze is cloudy, with flakes or rust, the system must be flushed with distilled water or a special cleaner (for example, LIQUI MOLY Kuhler-Reiniger).