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Subaru Forester1997-2005 of releaseRepair and operation of the car |
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Subaru Forester + Subaru Forester cars + Maintenance instruction + Routine maintenance + Engine - Cooling systems, heating Specifications Antifreeze - general information Check of serviceability of functioning and replacement of the thermostat Removal and installation of the fan of the cooling system Service, removal and installation of a radiator of the cooling system Removal and installation of a filling tank (model with a turbo-supercharging) Removal, check and installation of the water pump System of heating and ventilation of salon - the general information Removal and installation of a heater Removal and installation of the fan of a heater Check of serviceability of functioning and service of systems of heating and air conditioning + Power supply system and release + Engine electric equipment + Control systems of the engine + Gear shifting box + Coupling, transmission line + Brake system + Suspension bracket and steering + Body + Onboard electric equipment |
Cooling systems, heating Engine cooling systemAll models of the cars considered in the present manual are equipped with the engine cooling system working with an excessive pressure with thermostatic management of circulation of working liquid. The water pump of centrifugal type is fixed on the left semi-block of the engine and provides pumping of cooling liquid through a cooling path of the last. The drive of a water naos is carried out from a bent shaft by the back of a gas-distributing belt. The stream of liquid washes regions of an arrangement of each of cylinders in the block. The cooling channels laid in casting of the block and a head of cylinders provide intensive cooling of inlet and final ports, areas of installation of spark plugs and the directing plugs of final valves. The scheme of circulation of cooling liquid on models without turbo-supercharging The scheme of circulation of cooling liquid on models with a turbo-supercharging On models without turbo-supercharging the cooling system since launch of the engine passes through three modes of functioning: at the first stage until temperature of cooling liquid rose above 76 °C, it circulates on a small circle from a working contour of which the radiator is excluded; at a temperature of 76 ÷ of 80 °C the thermostat opens and the contour of circulation joins a radiator; on reaching temperature of cooling liquid of value of 95 °C the thermosensitive sensor switch providing operation of the fan of the cooling system, forced which the additional air stream considerably increases efficiency of functioning of the heat exchanger of a radiator works. On models with a turbo-supercharging at an engine stop after its work on high turns steam formed in a shirt of cooling of a turbocompressor is produced in a filling tank where there is its condensation and return to a working path of the cooling system through a broad tank. The Voskozapolnenny thermostat is built in an inlet branch pipe of the water pump and controls the working temperature of the engine in the course of its warming up. The first minutes after start of the cold engine the thermostat remains closed, preventing thereby circulation of cooling liquid through a radiator. In process of approach of temperature of the engine to normal working value, the thermostat valve gradually opens, connecting the radiator providing the maximum intensity of the heat sink from a working body (cooling liquid) to a cooling contour. The cooling system has a tight design and is densely closed by the cover of a radiator capable to maintain a certain excessive pressure that provides increase in a boiling point of cooling liquid and, respectively, efficiency of the heat sink through a radiator. At excess by internal pressure in system of some certain value, the sprung plate of the radiator of the safety valve which is built in in a cover rises over the saddle, providing an overflowing of excess of cooling liquid on a connecting (overflow) tube in a broad tank. In process of cooling of system liquid automatically comes back from a tank to a radiator. Schemes of functioning of the cooling system The scheme of functioning of the cooling system on models without air conditioner
The scheme of functioning of the cooling system on models with the air conditioner
Dolivaniye of cooling liquid in system is made through a mouth of a broad tank which at the same time acts also as the receiver accumulating in itself the excess of liquid which is forced out from a radiator. On models with a turbo-supercharging the radiator without jellied mouth is established. In view of the listed features of a design, such cooling system received the name closed as in it any functional losses of a working body are excluded. System of heating The main components of system of heating of salon are the electric fan and the heat exchanger placed in the box-shaped casing of a heater fixed under the car dashboard. The heat exchanger by means of rubber hoses is connected to the engine cooling system. The control unit of functioning of the heater/conditioner of air is built in in the car dashboard. The cooling liquid warmed in the engine circulates via the heater heat exchanger, giving the to the air which is warmly filling a casing. At inclusion of heating of salon there is an opening of the lamellar gate therefore the internal volume of a casing of a heater connects to the volume of salon. At turning on of the fan the krylchatka of the last begins to banish the air given to salon via the heat exchanger, providing its intensive warming up. Air conditioning system The condenser installed ahead of a radiator, the evaporator, close to the heater heat exchanger, fixed on the engine block the compressor, and filtering a receiver dehumidifier (accumulator) equipped with the reducing valve of high pressure are a part of air conditioning system. All components are connected among themselves by refrigerator lines. The fan banishes the air coming to salon through the evaporator heat exchanger working in the mode, the return to the mode of functioning of a radiator. The coolant which is pumped over via the heat exchanger begins to boil and, evaporating, selects excess of heat at air. Temperature in salon at the same time decreases to the required comfortable value (at the choice of the operator). The compressor supports circulation of coolant in system, pumping over the warmed liquid via the condenser where it is cooled and comes back to the evaporator. |
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