S-class W202 Mercedes

1993-2000 of release

Repair and car operation

W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
- 6. Heating, ventilation
   6.2. Conditioner
   6.3. Additional resistance
   6.4. Heating fan
   6.5. Device of service of heating
   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. Ignition system
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes

6.6. Diagnostics of malfunctions of system of heating

GENERAL INFORMATION

REASON	ELIMINATION METHOD
The heating fan does not rotate
Fused a safety lock of the electric motor of the fan.	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 on one of steps of speed
Defective additional resistance	Replace additional resistance.
Too low power of heating
Too low level of cooling liquid	Check 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 not tight or littered	Replace the heat exchanger (work for repair shop).
Warm air has a sweetish smell, at inclusion of heating glasses mist over
Heat exchanger leakage	Check cooling system on tightness. Replace the heat exchanger (work for repair shop).
Noise at operation of the fan of heating
Fan pollution	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.