Heating is provided by air heated in heater radiators.
Outside air enters the main heater through a grille located between the windshield and the hood
Then, depending on the position of the dampers, the air enters either through the heater radiator or through the air ducts.
The additional heater operates using the air inside the cabin.
We will consider defects that may arise during operation of the heating system, as well as methods for correcting defects.
- Cause of malfunction
Elimination method
Heater fan motor (main or auxiliary) does not work:
- The wires are damaged, oxidized or their tips are loose
Crimp the terminals, strip the tips, replace faulty wires
- Wear, freezing of electric motor brushes, break in the armature winding, oxidation, commutator wear
Clean the collector or replace the electric motor
- Short to ground of the armature winding (the fuse immediately blows)
Replace the electric motor
- Heater switch is faulty
Replace the switch
Heater fan motor does not work at low speed:
- An additional resistor has burned out, its wires are damaged or their tips are not tightly put on
Replace the resistor, crimp the terminals, strip the tips, replace faulty wires
- Heater switch is faulty
Replace the switch
Heater fan motor armature rotates slowly:
- The collector is contaminated or oxidized
Clean the collector or replace the electric motor
- Interturn short circuit of the armature winding (the fuse may blow)
Replace the electric motor
- Seizing of the armature shaft in the bearings (creaking, squealing, the fuse may blow)
Replace the electric motor
The car interior is not heated well:
- Insufficient coolant temperature
See Malfunctions of the engine and its systems
- Not enough liquid in the cooling system
See Malfunctions of the engine and its systems
- Sticking of the heater valve in the closed position, sticking of the cable flaps or breakage of the control cables, loosening of their fastening
Replace faulty faucet, cables, valves
Securely fasten the cable sheaths, lubricate the cables with engine oil, adjust the drives
- Heater radiator is faulty
Replace the radiator
The temperature in the cabin is not adjustable
- Jamming of the heater valve, dampers, cables in sheaths or their breakage, loose fastening of the cable sheaths
Replace faulty faucet, cables, valves
Securely fasten the cable sheaths, lubricate the cables with engine oil, adjust the drives