BMW 3 series E46

Since 1998 of release

Repair and car operation


The BMW of 3 series Е46
+ Cars BMW 3 (Е46)
+ Current leaving and service
+ The engine
- Systems of cooling, heating
   - System of cooling of the engine
      Replacement of a cooling liquid
      Thermoswitch check
      Check of system of cooling under pressure
      Connection and separation quick disconnect муфты
      Removal and thermostat installation
      Removal and installation of the fan / of a casing of the fan
      Removal and installation of the fan with вязкостной муфтой
      Removal and radiator installation
      Removal and installation of the pump of a cooling liquid
   + Heater and the conditioner of air of salon
+ Power supply systems, injection and release
+ Engine electric equipment
+ Manual transmission and transmission a line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electric equipment schemes


Thermoswitch check

The thermoswitch is at bottom шлана on a radiator. It connects the electrofan when the temperature of a cooling liquid reaches certain value.

Check conditions:

- The thermoswitch is necessary for checking up, if at a hot radiator the electrofan does not work.
- If the bottom hose of a radiator warm, the thermostat is serviceable. In the presence of malfunction of the thermostat the thermoswitch cannot connect the fan as it does not get warm by a cooling liquid.

Check of a thermoswitch without removal

1 Rasstykujte a thermoswitch socket.
2 Connect both contacts on the tip an auxiliary cable. If now the fan earns, malfunction is in a thermoswitch. Replace it. Fix a new thermoswitch with a new sealing ring the moment 20 Nm.
3 If despite a thermoswitch crosspiece, the switch does not work, check up reliability of connection of the tip with the electric motor of the fan and reliability of contact. Check up electric wires, the relay and the fan electric motor. Check up electric elements, address to the Head the Onboard electric equipment.

Check of the removed thermoswitch

4 Thermoswitch can be checked up also after removal. For this purpose it is necessary to attach an ohmmeter to switch contacts.


5 Ship a thermoswitch in hot water to level of a carving and measure resistance. At temperature +93 ± 2°С resistance should make 0 Ohm, at temperature more low +89°С resistance should be infinite.