Two-component flushing of the LAVR cooling system: article number LN1107, composition and step-by-step instructions

Flushing the engine cooling system is a procedure that many car owners put off until the last minute, until they encounter engine overheating, a radiator leak, or clogged channels. Two-component rinsing LAVR (article LN1107) is positioned by the manufacturer as a professional solution for deep cleaning of rust, scale and oil deposits. But how does it work in practice? Is it suitable for all types of antifreeze? And why do some masters prefer it to analogues like Liqui Moly or Hi-Gear?

In this article we will analyze LAVR LN1107 flushing composition, its advantages over single-component products, and we will also give step-by-step instructions taking into account the nuances for different engines. We will pay special attention compatible with aluminum radiators and turbocharged engines — here mistakes can lead to costly repairs. If you've already encountered problems with your cooling system (for example, the antifreeze has turned brown or sediment has appeared), this guide will help you avoid common mistakes when flushing.

What is a two-component flush LAVR LN1107: composition and principle of operation

Two-component cleaning system LAVR (article LN1107) differs from classic flushes in that it consists of two separate liquids that are used sequentially: first component — alkaline, dissolves organic deposits (oil, antifreeze decomposition products), second — acidic, removes inorganic contaminants (rust, scale, salts). This approach avoids neutralization of active substances, which often occurs in universal “single-bottle” products.

According to the manufacturer, the composition includes:

• 🧪 Surfactants (surfactants) — responsible for emulsifying oil deposits;
• 🧂 Acid components (based on organic acids) — dissolve rust and scale without aggressively affecting the metal;
• 🛡️ Corrosion inhibitors — protect aluminum and copper from damage;
• 💧 Distilled water - the basis for diluting the concentrate.

Important nuance: LAVR LN1107 does not contain aggressive inorganic acids (for example, hydrochloric or sulfuric acid), which can damage plastic or rubber parts of the system. However, this does not mean that the product is completely safe for all materials - more about this in the section on compatibility.

The manufacturer states that washing removes up to 95% pollution in one cycle, but in practice the effectiveness depends on the degree of clogging of the system. For example, if a lot of oil has accumulated in the radiator (due to a blown head gasket), re-treatment may be necessary.

When you need a flush: 5 signs of a clogged cooling system

Many car owners flush the cooling system only when replacing antifreeze, but there are signs that indicate the need for urgent cleaning:

1. Engine overheating for no apparent reason (the fan is running, there are no antifreeze leaks). Clogged radiator ducts or a thermostat that won't open due to deposits are often to blame.

2. Change in antifreeze color. If the liquid turns brown, cloudy, or has flakes floating in it, this is a sure sign that corrosion products or oils have accumulated in the system.

3. Poor interior heating in winter with a working stove. The cause is a clogged heater core that is not allowing enough antifreeze to flow through.

4. Extraneous noise in the pump or thermostat. Deposits can cause cavitation or make it difficult for the thermostat valve to operate.

5. Antifreeze leaks through microcracks in the radiator or pipes. Corrosion and scale thin out the metal, which leads to depressurization.

⚠️ Attention: If the antifreeze looks like “coffee grounds” or oil stains are visible in it, flush LAVR LN1107 You may not get it right the first time. In such cases, preliminary cleaning of the system with special means to remove oil (for example, LAVR Radiator Flush Oil Remover).

The manufacturer recommends using LN1107 every second antifreeze replacement (about once every 4–5 years), but if the car is operated in difficult conditions (frequent overheating, using water instead of antifreeze), the interval should be reduced to 2–3 years.

Step-by-step instructions: how to flush the LAVR LN1107 cooling system

Cleaning with a two-component solution LAVR takes about 2–3 hours and requires careful attention. It is important to observe the sequence and holding time of each component. Below are universal instructions suitable for most cars (including VAZ, Toyota, Hyundai/Kia etc.).

Preparation:

• 🔧 Drain the old antifreeze (if any) through the drain hole on the radiator and engine block.
• 🚰 Upload to the system distilled water (5–7 liters, depending on the volume of the system).
• 🔥 Start the engine, let it idle for 10-15 minutes, then drain the water. This will remove coarse dirt.

Step 1: Alkaline Wash (First Component)

1. Divorce first bottle (alkaline) in 3–5 liters of warm distilled water (proportions are indicated on the package).
2. Pour the solution into the cooling system through the expansion tank.
3. Start the engine and let it run 20–30 minutes at idle speed (before the thermostat opens).
4. Drain the liquid - it will be dirty, possibly with flakes.

Step 2: Acid wash (second component)

1. Divorce second bottle (acidic) similar to the first.
2. Fill the system and repeat the procedure while warming up the engine (20–30 minutes).
3. Drain the solution - at this stage rust and scale may come out.

Final rinse:

• 💦 Flush the system distilled water 2-3 times until the drained liquid is clear.
• 🔄 Make sure that all flushing residues are removed from the system - they can neutralize the additives of the new antifreeze.
• 🚗 Fill with fresh antifreeze that meets your vehicle's specifications.

Buy 10–15 liters of distilled water|

Check the system for tightness (no leaks)|

Prepare a container for draining old antifreeze|

Examine the location of the drain plugs (on the radiator and engine block)|

Stock up on gloves and rags (the components are aggressive to the skin) -->

⚠️ Attention: If your car has aluminum radiator (for example, on Nissan, Mazda or new VAZ), reduce the holding time of the acid component to 15 minutes. Keeping the solution longer is risky - metal corrosion may begin.

Compatibility with antifreezes and materials: what you need to know

One of the key questions when choosing a flush is whether it will be safe for your cooling system. Manufacturer LAVR states that LN1107 compatible with:

• 🔹 All types of antifreeze (G11, G12, G12+, G13);
• 🔹 Radiators from aluminum, copper and brass;
• 🔹 Rubber and silicone pipes;
• 🔹 Plastic parts (expansion tank, thermostat cover).

However, there are nuances:

1. Turbocharged engines. Turbine systems often use thinner cooling channels, which can become clogged with sediment after flushing. It is recommended to blow out the system with compressed air after the procedure.
2. Antifreeze based on glycerin. Some cheap antifreezes (for example, "Tosol-A40M") contain glycerin, which, when interacting with the rinse, can form gel-like clots. In this case, it is better to use specialized tools.
3. Systems with electric pumps. In hybrid or electric vehicles (e.g. Toyota Prius) Flushing may damage the pump seals. Please check with your dealer for compatibility before use.

If you are in doubt about compatibility, do a test: pour a small amount of diluted flush into a separate container with a piece of your system material (for example, an aluminum plate or rubber pipe) and observe for 30 minutes. The appearance of bubbles, discoloration or softening of the material is a signal that flushing cannot be used.

System material	Compatible with LAVR LN1107	Recommendations
Aluminum radiator	✅ Yes	Reduce acid wash time to 15 minutes
Copper/brass radiator	✅ Yes	Standard procedure
Silicone pipes	✅ Yes	Check for softening after washing
Plastic expansion tank	✅ Yes	Avoid overheating the solution (>60°C)
Turbocharged engine	⚠️ Conditional	Blow the system with air after flushing

Typical washing mistakes and how to avoid them

Even experienced car owners make mistakes that negate the effect of flushing or even harm the system. Here are the most common:

1. Use tap water instead of distilled water.

Tap water contains salts and minerals, which, after flushing, will settle in the system in the form of new scale. Always use only distilled water (it is inexpensive, and prevents serious problems).

2. Failure to comply with the holding time.

If you overexpose the acidic component, it will begin to corrode the metal, especially aluminum. If you underexpose it, the impurities will not dissolve. Keep track of the time using the timer!

3. Neglecting final rinsing.

Residues of the flushing agent in the system neutralize the additives of the new antifreeze, which shortens its service life. Flush the system with water until the drained liquid becomes completely clear.

4. Flushing without removing the thermostat.

The thermostat can become clogged with deposits, and if it is not flushed separately (or replaced), the cleaning efficiency of the entire system will be reduced. In some cases, it is better to remove the thermostat and clean it mechanically.

5. Filling with antifreeze immediately after flushing.

After draining the flush, moisture remains in the system. If you immediately pour in antifreeze, it will dilute and its frost resistance will deteriorate. Let the system dry for 10–15 minutes or blow it out with compressed air.

What happens if you mix the components of LAVR LN1107?

If you mix alkaline and acidic components LAVR LN1107 in the same container, they will neutralize each other, and washing will become useless. In addition, mixing may generate heat and gas, which is dangerous (risk of splashing). Always use the components separately and in the correct sequence!

Analogues of LAVR LN1107: which is better for your car?

Two-component rinsing LAVR is not the only solution on the market. In some cases, it is worth considering alternatives, especially if you have a specific cooling system (for example, with aluminum parts or a turbine). Let's compare LN1107 with popular analogues:

Flushing	Type	Benefits	Disadvantages	Price (per set)
LAVR LN1107	Two-component	Deep cleaning, suitable for most systems	Requires strict adherence to instructions	~800–1000 ₽
Liqui Moly Kuhler-Reiniger	One-component	Easy to use, gentle composition	Less effective for heavy soiling	~600–700 ₽
Hi-Gear Radiator Flush	Two-component	Removes oil deposits well	More aggressive towards aluminum	~900–1100 ₽
Wynn's Cooling System Flush	One-component	Suitable for turbocharged engines	High price	~1200–1400 ₽
Felix Proff	Two-component	Low price, good results	Difficult to find in stores	~500–600 ₽

If your cooling system is severely clogged oil (for example, due to a broken cylinder head gasket), it is better to choose specialized tools like LAVR Radiator Flush Oil Remover or Hi-Gear HG9014. They contain solvents that are more effective at removing oil deposits.

For aluminum radiators the optimal choice would be Wynn's or Liqui Moly - they are less aggressive. And if you need maximum cleaning (for example, before selling a car), two-component products (LAVR or Hi-Gear) will be preferable.

Reviews from car owners: real experience of using LAVR LN1107

To form an objective opinion about flushing LAVR LN1107, we analyzed reviews on the forums (Drive2, Autolada) and in stores (Exist, Autodoc). Here are the key observations:

Pros noted by users:

• ✅ Effectively removes rust and scale (especially in old systems).
• ✅ After washing, antifreeze retains its color and properties longer.
• ✅ Convenient packaging (two bottles of 250 ml each).
• ✅ Price is lower than Liqui Moly or Wynn's.

Cons and complaints:

• ❌ In case of heavy contamination, repeated rinsing is required.
• ❌ Some users complain about residual sediment in the system.
• ❌ The acid component can damage aluminum when overexposed.
• ❌ Doesn't always cope with oil deposits (pre-cleansing is required).

Real cases:

1. "Washed LAVR LN1107 on VAZ 2114 after 10 years of operation on antifreeze. So much dirt flew out of the radiator that I couldn’t believe my eyes! The engine temperature dropped by 5–7°C." — Alexey, Drive2.
2. "On Toyota Corolla 2010, flushing failed to remove oil traces (there was a cylinder head gasket failure). I had to buy more Hi-Gear HG9014." — Maxim, Autolada.
3. "After washing Nissan Almera there was a leak in the radiator. Apparently, the acidic component stayed on for too long." — Igor, Exist.

Conclusion: LAVR LN1107 works well on systems with moderate contamination, but for difficult cases (oil in antifreeze, severe corrosion) a combination with other products or mechanical cleaning may be required.

FAQ: Frequently asked questions about flushing LAVR LN1107

Can LAVR LN1107 be used to flush the cooling system of a diesel engine?

Yes, flushing is suitable for diesel engines, but with caveats:

1. Often found in diesel engines oil deposits due to a broken cylinder head gasket or a faulty oil cooler. In this case LN1107 may not work the first time - you will need to pre-clean with oil removers (for example, LAVR Radiator Flush Oil Remover).
2. If the system has oil cooler (intercooler), make sure that the flushing solution does not get into it. It is better to remove the pipes and wash them separately.

Otherwise, the procedure is the same as for gasoline engines.

How long after flushing can I add new antifreeze?

Minimum time - 10–15 minutes after the final rinse with water. This is necessary so that moisture evaporates from the system and the antifreeze is not diluted. Best option:

1. Drain off the last portion of water.
2. Blow out the system with compressed air (if you have a compressor) or let it stand with the expansion tank cap open for 15–20 minutes.
3. Close the drain plugs and fill with antifreeze.

If you are in a hurry, you can add antifreeze immediately, but then its concentration needs to be checked with a hydrometer and adjusted if necessary.

Is it possible to flush the LAVR LN1107 cooling system without removing the thermostat?

It's possible, but cleaning efficiency will decrease. The thermostat is one of the dirtiest places in the system, as its valve collects deposits. If you don't wash it separately:

• 🔹 It may jam in the closed position (the engine will overheat).
• 🔹 Remaining dirt will circulate through the system and settle on the walls again.

Recommendation: If the thermostat is easily accessible (for example, on VAZ 2110 or Toyota Corolla E12), remove it and wash it in a separate container with solution LAVR. If access is difficult (for example, on Volkswagen Passat B6), open and close the valve manually at least several times during flushing.

How is LAVR LN1107 different from other LAVR flushes (such as LN1105 or LN1108)?

U LAVR There are several lines of washes, and they are easy to confuse. Here are the key differences:

Article	Type	Purpose	Features
LN1107	Two-component	Deep cleaning of rust, scale, oil	The most universal, but requires strict adherence to instructions
LN1105	One-component	Preventative flushing	Less aggressive, suitable for regular care
LN1108	Specialized	Removing oil deposits	Used before LN1107if there is oil in the antifreeze
LN1109	Neutral	Final flushing before adding antifreeze	Removes residues from other washes

If you are not sure which flush to choose, start with LN1107 — it covers most tasks. If there is a lot of oil in the system, use first LN1108, then LN1107.

Is it possible to use LAVR LN1107 to flush the stove (heater radiator)?

Yes, but with reservations:

• 🔹 If the stove is clogged outside (dust, leaves), washing will not help - mechanical cleaning is needed.
• 🔹 If the problem is internal channels (clogged with sediments), LN1107 will cope, but you will have to flush the system with the heater pipes disconnected.
• 🔹 For a better effect, after flushing, blow out the stove radiator with compressed air (on both sides).

Important: if your car’s heater is integrated into the cooling system (as in most modern cars), it will be flushed automatically when the entire system is cleaned. The heater radiator needs to be flushed separately only if it is severely clogged.