Opel Astra, Zafira

Since 1998 of release

Repair and car operation



Opel Astra
+ Cars Opel Astra and Zafira
+ The operation manual
+ Routine maintenance
+ The engine
- Systems of cooling, heating
   Specifications
   Antifreeze - the general data
   + System of cooling of the engine
   + Systems of ventilation, salon and air conditioning heating
+ The 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

The general information

System of cooling of the engine


The 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 — Perepusknoj a hose
9 — the Oil radiator

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 is fixed on the block of the engine and provides prorolling of a cooling liquid through охладительный a path of the last. The liquid stream washes areas of an arrangement of each of cylinders in the block then goes to a back part of the engine. 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 Typical scheme of functioning of system of cooling of an internal combustion engine see an illustration).

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

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.

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broad tank (Routine maintenance see the Head) which simultaneously acts also in a role of the receiver accumulating in superseded from radiator surplus of a liquid.

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.

Systems of heating and salon ventilation

The basic 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 panel of devices of the car. The heat exchanger by means of rubber hoses is connected to system of cooling of the engine (the Typical scheme of functioning of system of cooling of an internal combustion engine see an illustration). The block of management is built in by functioning of a heater / of the 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 giving in salon is carried out through дефлекторы obverse level (two central and two lateral), nozzles of foot wells and дефлекторы обдува a windscreen. On models Zafira air intake in a back part of salon through дефлекторы, established in a back part of the central console is in addition organised.

Instructions for use elements of management of functioning of systems of heating, ventilation and air-conditioning in detail see the Operation manual.

Air central air


Principle of functioning of a central air of air

1 — the Fan
2 — the Evaporator
3 — the Broad valve
4 — the Service socket низконапорного a contour
5 — the Service socket высоконапорного a contour
6 — Dempfer of pulsations
7 — Dempfer of pulsations
8 — the pressure Gauge-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 высоконапорного a contour
B — the Liquid phase высоконапорного a contour
C — the Liquid phase низконапорного a contour
D — the Gas phase низконапорного a contour

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 Principle of functioning of a central air of air see an illustration).

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.

Instructions for use elements of management of functioning of systems of heating, ventilation and air-conditioning in detail see the Operation manual.

Safety measures

In avoidance ошпаривания, do not uncover at all a broad tank and do not disconnect any components охладительного a path at the hot engine. If there is a necessity for removal of a cover of a broad tank before full cooling of a cooling liquid, (though such situations should be avoided whenever possible), it is necessary to dump preliminary superfluous pressure in system. Wrap up a tank cover a thick layer of rags, then slowly turn on before hissing occurrence. When specifying in release of steam hissing will stop, slowly turn away a cover up to the end. If at last stage отворачивания 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 a skin and a paint and varnish covering кузовных panels. Casual splashes should be washed off immediately plentiful quantity at its finest. At all do not leave merged of the engine or a fresh cooling liquid 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 quantity of a cooling liquid in a digestive path live to an organism is fraught with the most serious consequences, up to a lethal outcome.








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