Mercedes of the S-class W202

1993-2000 of release

Repair and operation of the car

Mercedes W202
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
+ 5. Cooling system
- 6. Heating, ventilation
   6.2. Conditioner
   6.3. Additional resistance
   6.4. Heating fan
   6.5. Heating service device
   6.6. Diagnostics of malfunctions of system of heating
   6.7. Conditioner: not only "pluses", but also "minuses"
   6.8. Rules of service of the conditioner
+ 7. System of ignition
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electrical circuitries

6.6. Diagnostics of malfunctions of system of heating


The heating fan does not rotate
The fan electric motor safety lock fused. Check a fan safety lock, in case of need – replace.
The fan switch is faulty. Check whether tension on the fan electric motor moves. If is not present, remove and check the switch.
The electric motor is faulty. Replace the fan electric motor.
The fan of heating does not rotate at one of speed steps
Defective additional resistance Replace additional resistance.
Too heating low power
Too low level of cooling liquid Check the level of cooling liquid, in case of need – add cooling liquid.
The heating valve does not open Check the electromagnetic valve in system of access of water, make passable.
The heat exchanger is untight or littered Replace the heat exchanger (work for repair shop).
Heated air has a sweetish smell, at inclusion of heating glasses mist over
Leakage of the heat exchanger Check the cooling system for tightness. Replace the heat exchanger (work for repair shop).
Noise during the operation of the fan of heating
Pollution of the fan Remove the fan, clean the air channel.
Imbalance of a krylchatka of the fan, malfunction of the bearing Remove the electric motor of the fan and check ease of its rotation.