Cause of malfunction
|
Elimination Method |
Fan motor
heater does not work
| |
Faulty heater switch (checked with an ohmmeter)
|
Replace Switch |
Damaged wires, oxidized or loose ends, blown fuse No. 1 (voltage is not supplied to the motor)
|
Crimp terminals, strip lugs, replace faulty wires, blown fuse (by checking the circuits protected by it for the absence of a short circuit) |
Wear, freezing of the motor brushes, breakage in the armature winding, oxidation, wear of the commutator (voltage is applied to the electric motor, but it does not rotate)
|
Replace motor |
Short circuit on «mass» armature windings (fuse blows immediately when turned on)
|
Replace motor |
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
| |
Dirty or oxidized collector, interturn circuit of the armature winding (the fuse may be blown). Seizure of the armature shaft in the bearings (creaking, screeching, a fuse may blow)
|
Replace motor |
The car interior does not heat up well
| |
Insufficient coolant temperature
|
Cm. «The engine takes a long time to warm up to operating temperature» In chapter Engine Troubleshooting |
Too little fluid in the cooling system
|
Cm. «Coolant level drop in expansion tank» In chapter Engine Troubleshooting |
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
|