E46 series BMW 3

since 1998 of release

Repair and car operation


E46 series BMW 3
+ BMW 3 Cars (E46)
+ Current leaving and service
+ Engine
- Systems of cooling, heating
   - System of cooling of the engine
      Replacement of cooling liquid
      Thermoswitch check
      Check of system of cooling under pressure
      Connection and separation of the quick disconnect coupling
      Removal and thermostat installation
      Removal and installation of a fan / casing of the fan
      Removal and fan installation with the vyazkostny coupling
      Removal and radiator installation
      Removal and installation of the pump of cooling liquid
   + Heater and conditioner of air of salon
+ Power supply systems, injection and release
+ engine Electric equipment
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Schemes

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Thermoswitch check

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

Check conditions:

- The thermoswitch is necessary for checking, 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 cooling liquid.

Thermoswitch check without removal

1 Rasstykuyte I will corrode a thermoswitch.
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 of 20 N • m.
3 If despite a thermoswitch crossing point, the switch does not work, check reliability of connection of the tip with the electric motor of the fan and reliability of contact. Check electric wires, the relay and the fan electric motor. Check electric elements, address to Head Onboard electric equipment.

Check of the removed thermoswitch

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


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 below +89°С resistance should be infinite.