If your "ninety-ninth" heats up and boils, first check the electrical circuit for turning on the engine cooling fan, perhaps this is the whole point. It will not be difficult to understand it.
VAZ 21099
To repair a domestic VAZ 21099, you do not need to be a qualified auto mechanic. Russian-made cars have always been easy to operate and maintain.
VAZ 21099 belongs to the Lada "Sputnik" family. It was mass-produced at the Volga Automobile Plant from 1990 to 2004. Such cars were equipped with carburetor engines VAZ 2108 (1, 3 l), VAZ 21083 (1.5 l) and injection VAZ 2111 (1.5 l).
The engine cooling fan does not turn on in the car
So, you are faced with a problem - the cooling fan stopped turning on in the car. In this situation, do not despair, everything is quite fixable. Your actions will entirely depend on which engine is installed on the VAZ 21099, since the principle of turning on the fan is somewhat different on carburetor and injection units.
Fan switching principle
The fact is that on VAZ 2108 and 21083 engines, the electric fan is activated thanks to a sensor installed on the right side of the cooling radiator. The fan is switched on directly when its contacts are closed at a temperature of 99 ° C. On cars manufactured before 1998, the sensor controls the fan through a special relay 113.3747 located in the mounting block. And on the VAZ 2111 injection motor, the cooling fan works only through a relay on a signal from the control unit.
Troubleshooting on VAZ 2108 and VAZ 21083 engines
Thus, in order to eliminate a malfunction on the carburetor motor, it is necessary first of all to check the integrity of the fuses in the mounting block. Burnt fuses are easy to see with the naked eye. On machines up to 1998, check the relay for turning on the electric fan. If it is found that there is electrical contact between terminals "c" and "b" or no contact between "c" and "d", the relay must be replaced.
Also, one should not exclude the possibility of failure of the sensor installed in the car's radiator, as well as the electric fan itself. In order to test them for performance, it is enough to remove the contacts from the sensor and close them together. If the cooling fan starts working - it's all about the sensor, no - the problem lies in the motor of the electric fan.
Checking the inclusion of the fan on the VAZ 2111 engine
In case the injection engine is warming up, it is worth first checking the fuse that protects the electric fan circuit, then the auxiliary relay. The cooling fan relay can be found in the passenger compartment under the glove compartment. In doing so, make sure that the fan motor is forced into operation.
In addition, the electric fan on the VAZ 2111 engine is turned on according to the sensor located on the engine outlet. However, to establish a malfunction of this sensor, a service computer diagnostics is required.
