Saab 9-5

Since 1997 of release

Repair and car operation

Systems of heating, ventilation and air conditioning

The general information

The description of systems

The design of systems of ventilation with a heater and К/В is presented on an illustration.

The salon is divided on two zones, – the driver and passengers, – for each of which it is possible to establish individual parametres of ventilation, heating and an air conditioning, except a circulation mode. Management of system of ventilation with a heater and К/В is resulted in the Head Controls and operation receptions.

Hot ОЖ it is passed through the heat exchanger, heating up air passing through it. Air giving in salon is regulated заслонками. If to include the heater fan, air will move in salon more intensively. The fan can work with different speed. At closed заслонке ОЖ arrives on a small contour back in a contour of a radiator of the engine.

Before getting to salon, air passes through the filter in which the basic share of a dust settles. It is necessary to observe periodicity of replacement of the filter since the dusty filter limits air giving that will lead to a stagnation of air in salon. In addition the coal filter clearing air from final gases of diesel engines, etc. can be established

Distribution of streams of air of system of ventilation is carried out also with the help заслонок. On all models the air circulation mode is provided.

Air leaves salon through two ventilating apertures, located in a back part of the car.

Air central air (К/В) enters into a standard complete set of some models, and on other models can be established in addition. Besides, the system of automatic control by a heater and К/В (ACC) can be established. System ACC components are specified in illustrations.

Arrangement of components of system ACC

Works with system K/V should be carried out in a specialised workshop. Do not open a contour of circulation of a coolant as at contact with a skin the coolant can cause обморожение.

By means of system K/V air temperature in salon can be lowered concerning external temperature. At work of system humidity of air in salon decreases. In the crude weather, arriving fresh air preliminary it is cooled, then again heats up to the set temperature. Thus its drainage is made. By means of this procedure it is possible to get rid from запотевания glasses.

Components of system K/V and their arrangement are specified in illustrations.

Arrangement of components of system K/V

In system the coolant (type R134а) which depending on temperature and pressure can be in liquid or a gaseous state circulates. The schematical description of streams of a coolant is resulted on an illustration.

Coolant streams in system K/V

The conditioner compressor is resulted by a belt from a cranked shaft of the engine. He creates pressure in a contour of the coolant representing gas, and causes its heating. In конденсаторехладагент it is cooled by external air. Thereof разогретый the coolant passes in a liquid phase. Then under a high pressure the coolant is passed through the broad valve therefore pressure of a coolant falls. After that the coolant evaporates in a contour, simultaneously strongly being cooled. In the evaporator the coolant selects heat from air blown through it. Thereof air is cooled and arrives in car salon. As a result of heating in the evaporator the coolant turns to gas and under low pressure arrives in the compressor then circulation process repeats.

Design of the broad valve

On model with diesel engine V6 the additional heater working on diesel fuel can be established. Besides, for increase in a water stream through a radiator of a heater of the models delivered on the markets with a frigid climate, the circulating pump (the Design of system of ventilation with a heater and К/В see an illustration) can be established.