E39 series BMW 5

since 1996-2001 of release

Repair and car operation

Cooling system

The engine is equipped with circulating system of cooling with thermostatic regulation. While the engine is not heated-up, cooling liquid circulates only in a head and the block of cylinders, and at open heating - in the heat exchanger. At increase of temperature of cooling liquid the thermostat opens a big contour of cooling and liquid arrives in a radiator, passing it from top to down and is cooled with air passing through it. The pump of cooling liquid is actuated by a maple belt of the engine.

On a shaft of the pump of cooling liquid the fan is fixed. The fan provides radiator cooling by air. In the fan there is a vyazkostny coupling. At achievement by the air going from a radiator, temperatures 90°С in the vyazkostny coupling are worked by a bimetallic plate and connects the fan. After that the fan rotates with number of turns of the engine and provides the increased heat exchange until the temperature of cooling air will not fall below +60°С. After that the vyazkostny coupling is disconnected and reduces number of turns of the fan.

Thanks to partial connection of the fan useful engine capacity raises and fuel consumption decreases.

At the warmed-up engine before opening of a cover of a radiator put on it a thick rag to exclude a burn owing to emission of hot liquid and steam. There is a danger of accident. The cover can be opened only at temperature of cooling liquid below +90°С.

Scheme of a contour of system of cooling

1 — a radiator 2 — a broad tank 3 — a salon heater 4 — the thermostat 5 — the pump of cooling liquid	6 — the block of cylinders 7 — return 8 — giving 9 — heating of a butterfly valve 10 — the heater crane

Chemical heataccumulator

On some models the chemical heataccumulator can be established. It accumulates warmly cooling liquid, giving it later at start of the cold engine. Thanks to it heating of salon quicker works and heat loss in the atmosphere is reduced. Time necessary for warming up of salon and the engine is essentially reduced.

The heataccumulator consists of well isolated store in parallel connected to system of cooling of the engine and located around feet of the forward passenger. Depending on need, it takes away or gives to warmly cooling liquid. The stream of cooling liquid, in the course of work, automatically copes various electromagnetic valves.

The principle of its work is based on use of heat which is liberated at transformation of a non-polluting hydrochloric mix from a liquid state in the firm. Similar to warmth of thawing of ice there is an accumulation of warmth of the warmed-up engine as a result of liquefaction of a hydrochloric mix.

Thus, the thermal accumulator increases traffic safety and comfortableness of the car, without leading to emergence of additional load of environment.

The accumulator does not demand service as management of it is assumed by electronics.

Realization of this function is possible only at temperature of external air not above +15°С, at the heated-up engine to working temperature, and also sufficient tension of the accumulator.