Fig. 4.40. Scheme of circulation of cooling liquid: 1 – radiator; 2 – a broad tank with a cover; 3 – silicone element; 4 – a liquid tank for a screen wiper (it is warmed with cooling liquid); 5 – radiator of a heater of salon; 6 – the coupled heating adjustment gate; 7 – block of cylinders; 8 – pump of cooling liquid; 9 – thermostat; And – giving; In – an exit

The cooling system (fig. 4.40) serves for maintenance of normal temperature of operation of the engine. It includes a radiator with the thermostat; branch pipes and channels in the block and a head of cylinders in which cooling liquid circulates. The scheme of circulation of cooling liquid depends on its temperature and is regulated by the thermostat.

At start of the cold engine cooling liquid at first circulates on a small contour which is limited to the engine and system of heating.

Cooling liquid circulates in the engine. So the engine is warmed quicker. The radiator is connected only when cooling liquid reaches a certain temperature.

As soon as temperature of cooling liquid begins to rise, the thermostat opens a radiator and at the same time closes a small contour. At a working temperature cooling liquid circulates on the lower hose of cold liquid from the left tank of a radiator to the water pump which forces liquid in the engine block, a cooler of oil and a head of cylinders. The most part of liquid then via the open thermostat on the top hose of cooling liquid moves back, to the right tank of a radiator, and other part — in a car heating system radiator. The cooled liquid following from below from a radiator after pass of a contour is warmed and hot gets from above to a radiator. At pass down radiator lamels hot water is cooled. If at the movement of the car water temperature falls below the ordered worker of temperature, the thermostat blocks pass through a radiator that that time again until cooling liquid heats up adequately.