Opel Astra, Zafira

since 1998 of release

Repair and car operation



Opel Astra
+ Opel Astra and Zafira Cars
+ Operation manual
+ Routine maintenance
+ Engine
- Systems of cooling, heating
   Specifications
   Antifreeze - general information
   + System of cooling of the engine
   + Systems of ventilation, salon and air conditioning heating
+ Power supply system and release
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment




Systems of cooling, heating

General information

System of cooling of the engine


Typical scheme of functioning of system of cooling of an internal combustion engine

1 — the Heater
2 — the Power unit
3 — the Thermostat
4 — the Water pump
5 — the Broad tank

6 — the Cover with the valve
7 — the Radiator
8 — Perepuskna a hose
9 — the Oil radiator

All models of cars considered in the real Management are equipped with system of cooling of the engine working at superfluous pressure with thermostatic management of circulation of working liquid. The water pump is fixed on the block of the engine and provides pumping of cooling liquid through an okhladitelny path of the last. The stream of liquid washes regions of an arrangement of each of cylinders in the block then goes to a back part of the engine. Laid in molding of the block and a head of cylinders okhladitelny channels provide intensive cooling of inlet and final ports, areas of installation of spark plugs and directing plugs of final valves (see an illustration the Typical scheme of functioning of system of cooling of an internal combustion engine).

From the moment of engine start the system of cooling passes through three modes of functioning: at the first stage while the temperature of cooling liquid did not rise above a certain value, it circulates on a small circle from which working contour the radiator is excluded. In process of further warming up of liquid the tarelchaty valve included in a path of system of the vozkozapolnenny thermostat opens and the contour of circulation joins a radiator. Further, on reaching temperature of cooling liquid of the next control value, works the thermosensitive sensor switch providing activation of the fan of system of cooling, forced which the additional air stream considerably increases efficiency of functioning of the heat exchanger of a radiator.

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

Dolivaniye of cooling liquid in system is made through a mouth of a broad tank (see. Head Routine maintenance) which at the same time acts also as a receiver accumulating in forced out from a radiator excess of liquid.

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

Systems of heating and salon ventilation

The main components of system of heating of salon are the 4-speed electric fan and the heat exchanger placed in a box-shaped casing of a heater, fixed under the car dashboard. The heat exchanger is connected by means of rubber hoses to system of cooling of the engine (see an illustration the Typical scheme of functioning of system of cooling of an internal combustion engine). The control unit is built in by functioning of the heater / conditioner of air in the car dashboard. The cooling liquid warmed up in the engine circulates via the heater heat exchanger, giving the to air warmly filling a casing. At inclusion of heating of salon there is an opening of a lamellar zaslonka therefore the internal volume of a casing of a heater incorporates to salon volume. At turning on of the fan the krylchatka of the last starts to banish air submitted to salon via the heat exchanger, providing its intensive warming up.

Supply of air in salon is carried out via deflectors of obverse level (two central and two lateral), nozzles of foot wells and deflectors обдува a windscreen. On the Zafira models air intake in a back part of salon via the deflectors established in a back part of the central console is in addition organized.

Instructions for use elements of management of functioning of systems of heating, ventilation and conditioning it is detailed see. Operation manual.

Air central air


Principle of functioning of central air of air

1 — the Fan
2 — the Evaporator
3 — the Broad valve
4 — the Service socket of a low-pressure head contour
5 — the Service socket of a high-pressure head contour
6 — the Damper of pulsations
7 — the Damper of pulsations
8 — the pressure Sensor switch
9 — the Receiver dehumidifier
10 — the Additional fan
11 — the Condenser
12 — the Compressor

and — the Entrance stream of the cold air banished through the heat exchanger of the condenser
b — the Target stream of the heated-up air which banished through the heat exchanger of the condenser and has selected heat from a coolant
c — the Stream of air created by the fan
d — the Stream of air banished through the heat exchanger of the evaporator

A — the Gas phase of a high-pressure head contour
B — the Liquid phase of a high-pressure head contour
C — the Liquid phase of a low-pressure head contour
D — the Gas phase of a low-pressure head contour

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

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 (at the choice of the operator). The compressor supports coolant circulation in system, pumping over the warmed-up liquid via the condenser where it is cooled and arrives back in the evaporator.

Instructions for use elements of management of functioning of systems of heating, ventilation and conditioning it is detailed see. Operation manual.

Precautionary measures

In order to avoid an oshparivaniye, do not uncover at all a broad tank and do not disconnect any components of an okhladitelny path at the hot engine. If there is a need for removal of a cover of a broad tank before complete cooling of cooling liquid, (though such situations should be avoided whenever possible), it is necessary to dump previously superfluous pressure in system. Wrap up a tank cover a thick layer of rags, then slowly turn on before hissing emergence. When hissing indicating release of steam will stop, slowly unscrew a cover up to the end. If at the last stage of an otvorachivaniye hissing does not renew, the cover can be removed. In the course of performance of all procedure do not incline the person over a tank mouth, for protection of hands put on rubber gloves.


Try to avoid antifreeze hit on open sites of skin and a paint and varnish covering of body panels. Casual splashes should be washed away immediately plentiful quantity at its finest. At all do not leave merged of the engine or fresh cooling liquid being stored in open container. Passage traces at once collect rags. Remember that the sweetish smell of antifreeze is capable to draw attention of children and animals. Hit even insignificant amount of cooling liquid to the digestive highway live to an organism is fraught with the most serious consequences, up to a lethal outcome.