Cause of malfunction | Elimination Method |
Heater blower motor not working | |
Damaged wires, oxidized or loose ends | Crimp terminals, strip lugs, replace faulty wires |
Wear, freezing of the motor brushes, breakage in the armature winding, oxidation, wear of the commutator | Clean manifold or replace motor |
Short circuit on «mass» armature windings (fuse blows immediately) | Replace motor |
Faulty heater switch | Replace Switch |
Heater fan motor does not run at low speed | |
An additional resistor burned out, its wires are damaged or their tips are loose | Replace resistor, crimp terminals, strip lugs, replace faulty wires |
Faulty heater switch | Replace Switch |
Heater fan motor armature rotates slowly | |
Collector dirty or oxidized | Clean manifold or replace motor |
Interturn circuit of the armature winding (the fuse may be blown) | Replace motor |
Seizure of the armature shaft in the bearings (creaking, screeching, a fuse may blow) | Replace motor |
The interior of the car is heated poorly | |
Insufficient coolant temperature | See Diagnostics of malfunctions of the engine and its systems: «The engine takes a long time to warm up to operating temperature» |
Too little fluid in the cooling system | See Diagnostics of malfunctions of the engine and its systems: «Coolant level drop in expansion tank» |
Crane sticking in the closed position, jamming of the cable shutters or breakage of the control cables, loosening of their fastening | Replace faulty crane, cables, dampers. Fasten the cable sheaths securely, lubricate the cables with engine oil, adjust the drives |
Faulty heater core | Replace radiator |
The temperature in the cabin is not regulated | |
Jamming of the heater tap, dampers, cables in the shells or their breakage, the fastening of the cable shells has loosened | Replace faulty crane, cables, dampers. Fasten the cable sheaths securely, lubricate the cables with engine oil, adjust the drives |