3.9.1. Check of the cooling system

At the first signs of an overheat if the arrow of the index of temperature went to a red zone, but from under a cowl puffs of vapor do not escape, include the maximum mode of heating of salon (see. "Heating and ventilation of salon"). It is necessary to reduce temperature of cooling liquid in the engine cooling system.
Turn on the alarm system, squeeze out a pedal of coupling and, using inertia of the car, try to move carefully to the region of the carriageway and to stop as it is possible more to the right at a roadside and if it is possible, then outside the carriageway. Let's the engine work a couple of minutes at normal rate of rotation of idling with the heater included at full capacity.

Do not stop the engine at once! The only condition — preservation of tightness of the cooling system. If the hose burst or came off or other place of leak, except emission of liquid from under a stopper of a broad tank was formed, the engine should be stopped immediately!

After a stop of the superheated engine the local overheat of cooling liquid in places of its contact with the most heat-stressed details of the engine and formation of steam traffic jams begins. This phenomenon is called heatstroke.
1. Stop the engine.

Fig. 3.2. Places for survey in podkapotny space

2. Open a cowl and examine podkapotny space (fig. 3.2). Define from where steam escapes. At survey of the engine pay attention to availability of cooling liquid in a broad tank, to an integrity of rubber hoses, a radiator, the thermostat.

Never open a stopper of a broad tank at once. Liquid is in the cooling system under pressure, when opening a stopper pressure will sharply fall, liquid will begin to boil and its splashes can scald you. If you want to open a stopper of a broad tank on the hot engine, previously throw from above with a dense thick rag and only after that carefully turn off a stopper.

Useful tips
The large role in providing optimum temperature condition is played by the valve of a stopper of a broad tank. It supports the excessive pressure not less than 0,1 MPas (1,1 kgfs/cm2) in system. At the same time temperature of boiling of water increases to 120 °C, and cooling liquid — to 130 °C. Unfortunately, when jamming the valve in a closed position at an overheat there is considerable excess of excessive pressure — more than 0,2 MPas (2 kgfs/cm2) that can lead to a rupture of a broad tank or failure of one of hoses.
Therefore once a year a stopper of a broad tank needs to be washed out flowing water. In the presence of doubts replace a stopper. It is obvious if on the superheated engine to remove a stopper of a broad tank and on time this action will coincide with heatstroke, boiling up of liquid and formation of air traffic jams in the cooling system will be guaranteed.
Once a year wash out radiator cells a water stream of high pressure (on a special sink), directing a stream at first towards to the running air stream, and then in its direction for removal from a surface of a radiator of dirt, the stuck insects and road garbage. Thus it is possible to restore efficiency of a radiator partially.

Good advice
If leaks of cooling liquid are found, the burst hose can be restored temporarily by means of an adhesive tape. Especially well the adhesive tape which can be got in autoshops is suitable for this purpose reinforced (as a rule, silvery color).

It is quite difficult to eliminate a leak of a radiator, the thermostat or a heater on the place therefore in such situation it is necessary to add water in the cooling system and at the movement to watch closely the index of temperature, periodically restoring level in the cooling system.

Long use of water instead of cooling liquid leads to scaling in the engine cooling system, to deterioration in its cooling and, as a result, reduction of a resource.
Never add cold water in the superheated engine. The engine has to cool down with an open cowl not less than 30 min.

3. The engine can overheat in case of failure of the thermostat which regulates passing of a stream of liquid in the cooling system through a radiator or by it (for acceleration of warming up of the cold engine). For check of the thermostat it is necessary to check on the heated-up engine to the touch temperature of the hose connecting the thermostat case to a radiator. If the hose cold, the thermostat is faulty, there is no circulation through a radiator.
4. Very often the reason of an overheat of the engine which cooling system is equipped with the electric fan is a fan exit out of operation. Launch the engine, you watch temperature and pay attention whether joins at an engine overheat the cooling system fan.
5. If the fan does not turn on, perhaps, the safety lock fused, the inclusion relay is faulty, the electric motor fused or the electrical wiring is faulty.
6. Check integrity of an electrical wiring, reliability of connection of electric sockets.
7. If conducting as it should be, check a safety lock of the fan of the cooling system of the engine and in case of malfunction replace it.
8. If the safety lock is serviceable, try to replace the relay of turning on of the fan.
9. If the fan still does not turn on, check the electric motor. For this purpose take two additional wires and give on it power supply directly from the rechargeable battery. Wires have to be reliably fixed and isolated.

Do not allow short circuit of wires among themselves!
Pay attention to polarity of connection: the electric motor has to rotate so that the fan forced air through a radiator on the engine, and the directions of the formed stream of air and the running (traveling) stream coincided.

10. If the electric motor began to work, the electrical wiring is faulty; if is not present, the electrical wiring or actually the electric motor is also faulty. The relay and the electric motor are not maintainable, replace them in collecting (see section 10 "Electric equipment").

It is allowed to reach to the place of repair with the electric motor connected directly to the rechargeable battery. After arrival do not forget to disconnect the electric motor from the battery, otherwise it will lead to its category.