BMW 3 of the E46 series
since 1998 release
Repair and operation of the car
BMW 3 of the E46 series
+ BMW 3 Cars (E46)
+ Current leaving and service
- Cooling systems, heating
- Engine cooling system
Replacement of cooling liquid
Check of a thermoswitch
Check of the cooling system under pressure
Connection and separation of the quick disconnect coupling
Removal and installation of the thermostat
Removal and installation of a fan / casing of the fan
Removal and installation of the fan with the viscous coupling
Removal and installation of a radiator
Removal and installation of the pump of cooling liquid
+ Heater and conditioner of air of salon
+ Power supply systems, injection and release
+ Electric equipment of the engine
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schemes of electric equipment
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Engine cooling systemScheme of a contour of cooling
Cooling system elements
The engine is equipped with the circulating cooling system. While the engine is not heated-up, cooling liquid circulates only in a head and the block of cylinders and at the open crane of a heater in the heat exchanger of a heater of salon. At increase of temperature of cooling liquid the thermostat opens a big contour of cooling. Cooling liquid goes through a radiator constantly working pump. There is an innovation at petrol engines consisting in so-called cooling according to characteristics. Thus the control system of the engine regulates temperature of opening of the thermostat and optimizes, thus, engine temperature by criterion of fuel consumption.
Cooling liquid is filled in through a broad tank which is located sideways at a radiator and serves as capacity for liquid. It compensates the liquid expansion arising owing to its heating and gives the chance to it to decrease in volume after cooling of the engine.
For increase of efficiency of cooling in system the fan operated depending on temperature is installed. At increase of temperature of cooling liquid to +93 °C the thermoswitch connects the fan via the relay. If temperature of cooling liquid falls below +89 °C, the thermoswitch again switches off the fan.
320i, 323i, 328i with the conditioner: For increase of efficiency of cooling on a shaft of the pump of cooling liquid the additional krylchatka is established. In a nave the viscous coupling settles down. As soon as the air going from a radiator reaches temperature of +90 °C, the bimetallic plate in the viscous coupling connects the fan. The fan rotates with turns of the engine and provides a necessary consumption of air until temperature of the cooling air does not fall to value of +60 °C. After that, the viscous coupling is switched-off and reduces fan turns. Owing to changeably working fan the useful power of the engine increases and fuel consumption is cut.