The cooling fans are driven by two permanent magnet-excited DC motors
The engine management system controller controls the operation of the fans
The engine cooling fan motors are maintenance-free. In case of failure, replace them with new ones.
To check the health of the electric motors, use the data from the table. 1.
Data for checking the electric motors of the fans of the engine cooling system
Rated shaft speed when the motor is loaded with an impeller - 2600-2800 min -1;
Consumed current at the specified load and speed, no more than 25 A
The controller controls the relay for turning on the electric fans of the engine cooling system. The electric fans turn on and off depending on the engine temperature.
The diagram in Figure 2 is given for the ME17.9.71 Niva Chevrolet EURO-5 controller
Electric fans operate in two modes - with maximum performance (parallel connection) and with reduced performance (series connection) (Fig. 2).
The reduced performance of the electric fans turns on when the coolant temperature is above 99 ° C, as well as if there are DTOZH fault codes in the controller memory or when the air conditioner is running.
Electric fans are switched on sequentially through an additional relay.
An additional relay is controlled from the contact "X1/41" of the controller.
The reduced performance of the electric fans is turned off after the coolant temperature drops below 94 ° C.
The maximum performance of the electric fans turns on when the coolant temperature is above 101 ° C, as well as at high refrigerant pressure in the line, both with the air conditioner running and the air conditioner not running.
Electric fans are switched on in parallel through an additional relay, the right electric fan relay and the left electric fan relay.
An additional relay is controlled from the contact "X1/41" of the controller.
The control of the relay of the electric fan of the right and the relay of the electric fan of the left is carried out from the contact "X1 / 52" of the controller.
The maximum performance of the electric fans is turned off after the coolant temperature drops below 95 ° C.
If DTOZH DTCs are active, the cooling fans will run until the codes are cleared or the engine is stopped.
Replacing the electric motor
To remove the fan motor with a head of 10, unscrew the three nuts securing to the casing
Remove the motor with the impeller
We also remove another electric motor
Using two screwdrivers, remove the locking clip bu from the motor shaft
And remove the impeller
We also remove the impeller of another fan
Install the motors and fan in reverse order
When installing, it is necessary that the fixing pin inserted into the hole of the motor shaft coincides with the groove of the impeller hub
To remove the additional resistor with a Phillips screwdriver, unscrew the two screws securing it to the casing
Remove the resistor with the wiring harness
Install all parts in reverse order.