Cause of malfunction
Remedy
The electric motor does not work
- Damaged wires or oxidized wire connections
Check and restore connections.
Replace damaged wires
- Blown fuse F18 in the fuse box
Replace the fuse
- Damaged heater switch - no voltage is supplied to the output terminals of the switch
Check the switch, replace with a new one if necessary
- Sticking or worn out brushes of the electric motor, open circuit in the armature winding or contamination of the commutator
Check the electric motor, repair or replace
Short circuit to ground of the armature winding - the fuse blows when the electric motor is turned on
Replace the electric motor
The electric motor only runs at one speed
The wires are damaged or the wire connections are oxidized
Check and restore the connections.
Replace the damaged wires
- The heater switch is damaged
Check the switch, replace it with a new one if necessary
- The additional resistor has burned out
Replace the additional resistor
The electric motor armature rotates slowly
- The collector is dirty or oxidized, the brushes are worn
Clean the collector, replace the brushes
- Interturn short circuit in the armature winding
Replace the electric motor
- The anchor shaft is jammed in the bearings
Replace the electric motor
Features of the heater electric motor for Euro3
The electric motor connection diagram is shown in Figure 1
An additional resistor is used to change the fan speed
An additional resistor is attached to the left side of the heater radiator casing
The resistor has three spirals and a fuse
When three spirals are connected to the electric motor power supply circuit, the first fan speed is ensured
If two spirals are connected, the second speed is turned on; if one spiral is connected, the third speed is turned on
When the electric motor is turned on without a resistor, the fan rotor rotates at maximum speed (3000 min -1)
If the electric motor is faulty, it is recommended to replace it with a new one. Of course, you can clean the collector
You don't have to remove the electric motor from the car to clean the collector. Just remove the water deflector shield, the protective casing of the electric motor, and then the cover of the electric motor with the brush holder
Characteristics of the electric motor:
- - shaft rotation speed when the electric motor is loaded with an impeller at a voltage of 12 volts and a temperature of (25±10) º C, min -1 – 3000;
- - current consumption at the specified load and rotation speed – no more than 18 A.
