Saab 9-5

Since 1997 of release

Repair and car operation

System of cooling of the engine

The general information and safety measures

The scheme of system of cooling of 4-cylinder engines

The scheme of system of cooling of petrol engines V6

The scheme of system of cooling of diesel engines V6

The system of cooling of the engine works on following algorithm. While the engine is not heated-up, the cooling liquid (ОЖ) is pumped over by constantly working pump only in a head and the block of cylinders, and also in the heat exchanger of a heater of salon. At rise in temperature ОЖ to certain level the thermostat opens the big contour of cooling and ОЖ circulates in addition through a radiator (from top to down) and is cooled by air passing through it. At achievement of temperature ОЖ of higher value the electric fan of system of cooling which creates an additional air stream through edges of a radiator for more intensive heat removal from it joins. In process of opening of the thermostat the volume of the liquid submitted from it to the heat exchanger of a heater, decreases. On models with petrol engines V6 the broad tank is connected to the case of a throttle for maintenance of its heating.

The water pump is resulted from a cranked shaft: on petrol models a belt, and on diesel – directly through a gear wheel. The thermostat of 4-cylinder engines is in the case located on a left-hand side of the engine. The thermostat of petrol engines V6 is located on the right party of the engine. On diesel models the thermostat is placed in the case, fixed on маслоохладителе (in front of the engine), and is equipped by the additional valve for prorolling of system of cooling. On 4-cylinder models without air conditioner (К/В) one fan of a radiator operated signals from the gauge of temperature ОЖ (ECT) is established. On other models it is established two fans of a radiator. Fans of models with К/В join in following cases:

At achievement in temperature ОЖ of certain value (Specifications see); At compressor K/V inclusion (on low speed), if an ambient temperature above 22 hailstones., or at movement of the car with a speed below 38 km/h and pressure in lines К/В between 9 and 18 атм.; At compressor K/V inclusion (on high speed), if pressure in lines К/В above 18 атм.

Before work in an impellent compartment, especially in the field of the radiator fan, necessarily disconnect a negative wire from the storage battery and a socket of electroconducting of the fan. The radiator fan can join because of effect of heat conductivity even at the switched off ignition.

Do not open a cover of broad tank ОЖ before full cooling of the engine in order to avoid a burn a hot liquid or its steam.

If necessary to open a cover of a broad tank at the hot engine wind with its thick layer of rags. Uncover slowly, gradually reducing pressure of steam.