Prius inverter coolant

Hi all! Before the first winter (a little over a year ago) in the Amur region, it was decided to change the coolant (coolant) in the internal combustion engine and inverter. The winters here are harsh, and the coolant freezing test showed -25 in total. At that time, the mileage was about 104,500 km. According to the book, filling capacity for internal combustion engines, l: Right-hand drive - 5.3 Left-hand drive - 5.5 Car with a “thermos” - 8.6 There is no data on the inverter. In fact, in total it took about 6 liters +/- for everything (ICE + Inverter). Regarding the liquid used (ethylene glycol antifreeze), there are two types (the main difference between them is the price and replacement interval): The main difference between them is the price and replacement interval 1. SLLC - super long Liffe Coolant - pink color (recommended replacement 4 years or 80 thousand km) 2. LLC - long Liffe Coolant - reddish color (recommended replacement 2 years or 40 thousand km) (if necessary, need to be diluted with distilled/demineralized water) In my version, I used LLC - manufacturer TCL, undiluted. I did not flush the system.

What you will need: 1. Overpass, garage with a pit, or the like. 2. Coolant (coolant) 3. Container for draining the old one 4. Dropper (a very important and necessary thing in car maintenance) 5. Set of hexagons (6 key) 6. Set of open-end wrenches and sockets 7. Rags for wiping hands and spills 8. Funnel Since the car has two cooling circuits (inverter and internal combustion engine), I changed both at once. In this case, the radiator is also divided into two, in one case there are, as it were, two radiators for different cooling circuits. First of all, drain the old coolant. Choosing where to start: Inverter or internal combustion engine - optional. 1. Drain the old coolant.
Inverter:
- there is a plug on the block at the bottom under the car (like when changing the oil in a planetary gearbox, located nearby), unscrew it and drain it. To speed up the process, unscrew the cap of the inverter coolant expansion tank. In this way, the system is completely emptied. To check, I decided to remove the pipes from the radiator, everything turned out to be empty (but then it’s difficult to put the pipes back in place, since they have double clamps)

Cooling system. Coolant Toyota Prius Hibr >

For a gasoline engine, everything is like all cars - a mechanically driven pump.

There is a lot to pay attention to when it comes to the hybrid drive.

The Prius has two cooling systems - one, like on conventional cars, has a circuit: internal combustion engine / interior heater / radiator. The second system cools the hybrid part of the Prius, namely the power plant with electric motors and the inverter. The inverter is a silver box next to the gasoline engine that catches your eye when you open the hood. The fluid in the hybrid circuit circulates due to an additional electric pump, which is located behind the left front headlight. Two cooling circuits operate autonomously and have their own volume of coolant and, accordingly, two expansion tanks with liquid level control.

What should a Prius owner be concerned about when monitoring the cooling system?

1. Availability of coolant (monitoring through the transparent walls of the expansion tanks using the lower/upper level marks)
2. Fluid circulation in a hybrid circuit
3. Checking the freezing point of the coolant

Why am I focusing on the hybrid circuit? The fact is that stopping circulation in the hybrid circuit (stopping the pump, airing the circuit) leads to overheating of the inverter with subsequent failure. Let me remind you that the inverter converts direct current from the traction battery into alternating current to supply alternating current to the traction electric motor. If in winter, in the absence of fluid circulation, the Prius can feel quite good, then when the summer heat sets in, a heat sink is extremely necessary. Experience shows that the weak point in the Prius cooling system was the electric cooling pump of the hybrid installation. According to the experience of the owners, the end came after 90-100 thousand kilometers (individually, it’s different for everyone, of course, but a trend has emerged). Considering that Toyota announced a guarantee for the hybrid part of 160 thousand km, then the manufacturer could not answer this question leave without attention. Thus, a service campaign to replace this unit appeared. Read more about my pump replacement through the Toyota Service Company here.

And so point by point:

1. The liquid filled in at the factory is called Super Long Life Coolant (SLLC) and has the original pink color. Do not confuse the color of your native antifreeze with red LLC, much less mix these antifreezes. The fact is that the original antifreeze is designed for long-term use - the first replacement is regulated after 160,000 km, the next after 80,000 km and differs in the additive package from regular red antifreeze.

If you add red LLC, then only to get to the service center and make a complete replacement, that is, short-term use is allowed, but no more.

Gasoline engine cooling circuit capacity:

Prius LHD 5.5L

Prius RHD 5.3L

2.7L hybrid cooling system

If the car is equipped with a thermos, add another 2 liters

The second point is diagnosed visually; when the hybrid is turned on, there should be circulation in the expansion tank of the hybrid cooling system. If you don’t trust your eyes, then you can put your hand behind the left headlight and touch the electric pump of the cooling pump - there will be vibration on the hoses and a hum will be heard.

Replacing Toyota Prius antifreeze in Moscow: addresses of technical centers

1,832 auto repair centers

1. Stoa
2. Novofedorovskoe settlement, block No. 135, Torgovaya Square, 12, building 1
3. +7
4. daily, 09:00–22:00

3.2 4 ratings

4.2 4 ratings

4.4 85 ratings

3.2 43 ratings

4.6 18 ratings

4.6 4 ratings

4.3 3 ratings

4.4 10 ratings

5.0 44 ratings

4.6 12 ratings

4.7 5 ratings

5.0 3 ratings

1 184 Show car services on the map

Replacing Antifreeze in the Prius 30 Inverter

Replacing antifreeze in the Toyota Prius hybrid transmission is carried out in 2 cooling systems, which is justified by the engine design. Each cooling system operates independently using separate expansion tanks. One of them is the standard gasoline engine cooling circuit: the engine casing is the main and heating radiator for the cabin.

The 2nd circuit is designed to cool the inverter and motor. An additional electronic pump installed in the front left headlight compartment is used to turn on the antifreeze.

Let's see how the Toyota Prius XW20 antifreeze changes, indicating the required volume and class of cooling water.

Content

Briefly about Prius cooling systems

When using a Toyota Prius, you need to monitor the following cooling system characteristics:

• the level of antifreeze in the expansion tank, according to the marked lower and upper limits;
• compliance of the last freezing point of antifreeze with modern climatic criteria;
• circulation of cooling water in the electrical circuit.

The emphasis on a hybrid cooling system is justified by the threat of failure of the inverter, which is responsible for converting direct current into alternating current and then supplying power to the engine. During use, the Toyota Prius 20 hybrid system coolant pump was found to last approximately 100,000 kilometers. When the marked element fails, the radiator fails as a result of inverter failure.

The first antifreeze change in the Prius XW20, according to official maintenance recommendations, is 160,000 km, and in the future. 80,000 km.

The factory coolant water uses pink Super Long Life Coolant brand antifreeze. It is allowed to combine with other types of antifreeze only to get to a service station where a complete change will be made.

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Coolant volume Toyota Prius:

In the scheme with an internal combustion engine: 5.5 liters. for models with left-hand drive and 5.3 liters. with the right;

Electric traction cooling system. 2.7 l;

If you have a Prius thermos configuration, the extra two quarts will come in handy.

Which antifreeze to choose?

There are quite a few antifreeze options available for the Toyota Prius. Let's focus on two types: G12 and G12.

G12 carboxylate antifreeze is available in red or orange. It is a non-organic, toxic substance with a maximum boiling point of 115 degrees. It can only be used in cooling systems with brass radiators. When used in a cooling circuit with duralumin elements, the corrosion-resistant film will be destroyed (due to active G12 additives). Appears due to the parameters of the metal, which is included in the criteria for low exposure to water from the environment.

The main components of Gbr Lobridic for cooling are organic acids and silicates, which form an anti-corrosion film. The toxic substance has a corresponding pink color. Designed for use in all engines of a hybrid unit.

Currently, non-toxic antifreeze G13 is produced for all cooling systems of hybrid installations. However, its price is cheaper than previous versions.

The Toyota Prius 30 will likely change the antifreeze concentrate. If you dissolve coolant from concentrate, you can measure the freezing point obtained with a regular hydrometer. The cost of the designated measuring device is not high.

Replacing coolant in the inverter and internal combustion engine circuits

Replacing Prius antifreeze will require preparing a certain set of tools and materials. From them:

• drain tank for cooling water (coolant)
• hexagons;
• heads;
• spanners;
• new antifreeze;
• rags;
• hoses and droppers;
• funnel.

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You will need to call the inspection hole to get the job done.

Drain old coolant

First you will need to drain the coolant into the circuit using the inverter. To do this you will need:

Look around the bottom of the machine and locate the drain plug. It is located next to the planetary box. At this stage it is important not to confuse the elements. To ensure the plug is installed correctly, check the cooling pipe connection points.

Place the appropriate container under the stopper and unscrew it.

Unscrew the cap from the expansion tank and wait until the circuit is completely empty.

The procedure for draining coolant from a gasoline engine system is as follows:

• The liquid is connected through special taps. One is installed specifically on the cylinder block in the exhaust manifold area. 2nd place on the radiator;
• A suitable container is also prepared to receive old antifreeze;
• Before opening the mixers, it is recommended to attach the appropriate diameter and length to the mixer hoses. This will prevent coolant from spilling;
• Open the taps, remove the cap from the expansion tank and wait until the circuit is completely empty.
• In the future, it will be necessary to replace the inverter drain plug and close the valves in the cooling system of the internal combustion engine.

Filling and bleeding the system

The cooling system of the motor and inverter is filled through the corresponding expansion tanks. In this case, you need to open the ventilation valve in advance:

• in a chain with a gasoline engine, it is located in the upper right part of the radiator, opened with a hexagon;
• In the inverter cooling system, fittings are installed on the front of the inverter.

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New antifreeze should be added slowly. This helps fill the void better. During the filling process, the cooling pipes must be pressed against the air outlet. Once water is released from open vents, they should be blocked. Subsequently, the coolant will be replenished in the expansion tanks to a level between the highest and lowest risk.

Now you need to pump the antifreeze to remove any remaining air. A convenient dropper of a convenient length is useful for this. First bleed the inverter cooling circuit. Place one end of the dripper on the fitting and the other. into the expansion tank so that it is immersed in liquid. Open the vent and start the engine. During circulation, coolant will be forced out. This manifests itself in the formation of bubbles in the expansion tank. Once the grunting is over, we lock the fitting and turn off the engine. The cooling circuit of the internal combustion engine is injected in a similar way. The radiator fan has only a dropper installed, and the other end specifically falls into the radiator.

Upon completion of coolant injection, we set the required level in the expansion tanks. Last step. heating the hybrid unit to operating temperature to open the large cooling circuit. The antifreeze level is then monitored again.

Conclusion

You can change your antifreeze on your Toyota Prius 20 without any help. You will need to find an hour of free time for this. With all this said, cooling system maintenance, done right, can eliminate inverter failure.

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