Replacing the coolant (VAZ-2109)

Remove the expansion tank cap and open the body interior heater tap. Remove the engine mudguard by unscrewing the bolts securing it to the body. Place a container under the engine, unscrew the radiator and cylinder block drain plugs and drain the fluid. Screw the plugs back in after draining.

Fill the system with clean water through the filler neck of the expansion tank to the normal level and screw the tank cap back on. Start the engine and warm it up at medium crankshaft speed. The water will circulate in both circuits, flushing the engine radiator as well. Let the engine run for 3...4 minutes. Then stop the engine, drain the water, fill the system with clean water again and repeat flushing.

Stop the engine, drain the water and fill the system with coolant. Start the engine and let it idle for 1...2 minutes to remove air locks.

After the engine has cooled down, check the fluid level. If the level is below normal and there are no leaks in the system, top up the fluid.

In northern regions, where antifreeze is kept cold for a long time, it ages more slowly. Therefore, after the end of the warranty period, (60,000 km of car mileage) you can drain the coolant and check its quality. If there is no dirt or oil in the liquid and it has retained its blue color, you can measure the density, bring it up to standard if necessary, and use it for another year. After a year of operation, repeat the check.