Possible malfunctions of the heater fan motor (VAZ-21051)

Cause	Method of elimination
The electric motor does not work
The wires are damaged or the wire connections are oxidized	Check and repair connections. Replace damaged wires
Fuse 1 in the mounting block has blown	Replace the fuse
The heater switch is damaged - voltage is not supplied to the output terminals of the switch	Check the switch, replace with a new one if necessary
Sticking or wear of the electric motor brushes, breakage in the armature winding or contamination of the commutator	Check the electric motor, repair or replace
Short circuit to ground of the armature winding - when the electric motor is turned on, the fuse burns out	Replace the electric motor
The electric motor only operates at one speed
The wires are damaged or the wire connections are oxidized	Replace damaged wires, strip wire ends
The heater switch is damaged	Replace the switch
The additional resistor burned out	Replace the resistor
The motor anchor rotates slowly
Contamination or oxidation of the collector, wear of the brushes	Clean the commutator, replace the brushes
Interturn short circuit in the armature winding	Replace the electric motor
Seizure of the anchor shaft in the bearings	Disassemble the electric motor, clean the shaft journals