Subaru Forester

1997-2005 of release

Repair and car operation



Subaru Forester
+ Cars Subaru Forester
+ The maintenance instruction
+ Routine maintenance
+ The engine
- Systems of cooling, heating
   Specifications
   Antifreeze - the general data
   Check of serviceability of functioning and thermostat replacement
   Removal and installation of the fan of system of cooling
   Service, removal and installation of a radiator of system of cooling
   Removal and installation of a filling tank (model with a turbo-supercharging)
   Removal, check and installation of the water pump
   System of heating and salon ventilation - the general information
   Removal and heater installation
   Removal and installation of the fan of a heater
   Check of serviceability of functioning and service of systems of heating and air conditioning
+ The power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Gear change box
+ Coupling, трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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Systems of cooling, heating

System of cooling of the engine

All models of cars considered in the present Management are equipped by system of cooling of the engine working at superfluous pressure with thermostatic management of circulation of a working liquid. The water pump of centrifugal type is fixed on the left semiblock of the engine and provides prorolling of a cooling liquid through охладительный a path of the last. The drive water наоса is carried out from a cranked shaft by the back party газораспределительного a belt.

The liquid stream washes areas of an arrangement of each of cylinders in the block. Laid in moulding of the block and a head of cylinders охладительные channels provide intensive cooling of inlet and final ports, areas of installation of spark plugs and directing plugs of final valves.

The scheme of circulation of a cooling liquid on models without a turbo-supercharging

1  — the  Radiator
2  — the  Right semiblock
3  — the  Shirt of cooling of the right semiblock
4  — the  Left semiblock
5  — the  Shirt of cooling of the left semiblock
6  — the  Water pump

7  — the  Thermostat
8  — the  Right head of cylinders
9  — the  Left head of cylinders
10  — the  Heat exchanger of a heater of salon
11  — the  Electromagnetic valve of system of stabilisation of turns of idling (IAC)
12  —  Throttle заслонка


The scheme of circulation of a cooling liquid on models with a turbo-supercharging

1  — the  Radiator
2  — the  Right semiblock
3  — the  Shirt of cooling of the right semiblock
4  — the  Left semiblock
5  — the  Shirt of cooling of the left semiblock
6  — the  Water pump
7  — the  Thermostat
8  — the  Right head of cylinders

9  — the  Left head of cylinders
10  — the  Heat exchanger of a heater of salon
11  — the  Electromagnetic valve of system of stabilisation of turns of idling (IAC)
12  —  Throttle заслонка
13  —  Turbokompressor
14  — the  Filling tank
15  — the  Broad tank
16  —  Masloohladitel


On models without a turbo-supercharging the system of cooling from the moment of engine start passes through three modes of functioning: at the first stage while the temperature of a cooling liquid has not risen above 76 С, it circulates on a small circle from which working contour the radiator is excluded; at temperature 76 80 С the thermostat opens and the circulation contour joins a radiator; on reaching temperature of a cooling liquid of value 95 С works the thermosensitive gauge-switch providing operation of the fan of system of cooling, forced which additional air stream appreciably raises efficiency of functioning of the heat exchanger of a radiator. On models with a turbo-supercharging at a stop of the engine after its work on high turns formed in a cooling shirt турбокомпрессора steam is issued in a filling tank where there is its condensation and return to a working path of system of cooling through a broad tank.

The voskozapolnennyj thermostat is built in an inlet branch pipe of the water pump and supervises working temperature of the engine in the course of its warming up. First minutes after start of the cold engine the thermostat remains closed, preventing thereby circulation of a cooling liquid through a radiator. In process of approach of temperature of the engine to normal working value, the thermostat valve gradually opens, connecting to a contour of cooling a radiator providing the maximum intensity of a heat-conducting path from a working body (cooling liquid).

The cooling system has a tight design and is densely closed by a cover of the radiator, capable to maintain certain superfluous pressure that provides increase of a boiling point of a cooling liquid and, accordingly, efficiency of a heat-conducting path through a radiator. At excess by internal pressure in system of some certain value, подпружиненная the plate of the radiator of a safety valve built in in a cover rises over the saddle, providing an overflowing of surplus of a cooling liquid on connecting (переливной) to a tube in a broad tank. In process of cooling of system the liquid automatically comes back from a tank in a radiator.

Schemes of functioning of system of cooling

The scheme of functioning of system of cooling on models without air conditioner


The scheme of functioning of system of cooling on models c air conditioner


Доливание a cooling liquid in system it is made through a mouth of a broad tank which simultaneously acts also in a role of the receiver accumulating in superseded from radiator surplus of a liquid.

On models with a turbo-supercharging the radiator without a jellied mouth is established.

In view of the listed features of a design, such system of cooling has received the name closed as in it any functional losses of a working body are excluded.

Heating system

The basic components of system of heating of salon are the electric fan and the heat exchanger placed in a box-shaped casing of a heater, fixed under the panel of devices of the car. The heat exchanger by means of rubber hoses is connected to system of cooling of the engine. The block of management is built in by functioning of a heater/conditioner of air in the panel of devices of the car. Разогретая in the engine the cooling liquid circulates through the heater heat exchanger, giving the to air warmly filling a casing. At inclusion of heating of salon there is an opening lamellar заслонки therefore the internal volume of a casing of a heater incorporates to salon volume. At fan inclusion крыльчатка air submitted to salon through the heat exchanger starts to banish the last, providing its intensive warming up.

Air central air

The central air structure includes the condenser established ahead of a radiator close to the heat exchanger of a heater the evaporator, fixed on the block of the engine the compressor, and the filtering receiver-dehumidifier (accumulator) equipped редукционным with the valve of a high pressure. All components are connected among themselves by refrigerator lines.

The fan banishes air arriving in salon through the heat exchanger of the evaporator working in a mode, the return to a mode of functioning of a radiator. The coolant pumped over through the heat exchanger begins to boil and, evaporating, selects at air surplus of heat. The temperature in salon thus decreases to demanded comfortable value (for choice the operator). The compressor supports coolant circulation in system, pumping over разогретую a liquid through the condenser where it is cooled and arrives back in the evaporator.