SOD on the VAZ 1118 refers to closed-type liquid cooling systems. This means that the thermal energy from the heated parts of the engine is removed by the flow of coolant, that is, coolant (antifreeze or antifreeze). One of the sores of the first generation Lada Kalina is the appearance of an airlock in the engine cooling system, and as a result, the heater does not work correctly. Quite often, this happens precisely on the eve of winter. Frost, wind, I want to jump into the warm interior of the car, and then … either the stove does not heat, then the engine does not heat up above 80 degrees in motion, then it boils in frost …
One of the signs of airing the system can be a gurgling sound in the area of the torpedo, and if at the same time you notice that the heater in the position on the red division began to blow with cold air, then the reason for this is the airlock in the SOD. The reasons for its appearance are various, often this problem appears due to loose clamps on the system pipes, so periodically inspect all connections of hoses and pipes.
The first way to remove the plug is to remove the cap from the expansion tank, start the engine and, pressing the gas pedal, warm up the engine until the temperature arrow reaches the red scale. After the fan turns on, you can turn off a little more gas and then turn off the ignition. The method is simple, but, alas, it does not always help.
A more radical and also more effective way is as follows - it is necessary to remove the plastic screen of the engine, then loosen the clamp with a screwdriver and remove one of the two hoses from the heating fitting of the throttle assembly. Then unscrew the cap of the expansion tank, it is better to cover the neck with a clean cloth and blow into the expansion tank until the coolant flows out of the removed hose.
You can also use an autocompressor for this procedure, but this will require a second cap with an embedded nipple for tubeless tires. The compressor hose is attached to it. In the case of using the compressor, it is better to act together, the assistant will control its operation, and when the antifreeze runs out of the hose, turns off the compressor, and in the meantime you pinch the hose with your finger and then install it back on the fitting on the throttle assembly.
Sometimes it is enough, after warming up the car to a temperature of 96-102 degrees, turn off the ignition and, without removing the cap from the expansion tank, remove the heating hose of the throttle assembly, wait until the antifreeze flows out of it under pressure.
Since the coolant is very toxic and poses a certain danger to humans, I recommend draining the coolant with extreme caution and better with rubber gloves.
