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


Replacement of a cooling liquid

It will be necessary for work for you:

- Viewing hole or the hydraulic garage lift with supports.
- Nakidnoj key or head.
- Capacity for a cooling liquid.
- Antifreeze. The marks of antifreeze resolved by firm BMW are thus supposed to application only. Address to Specifications. Attention: mixing of antifreeze of various marks is not supposed.
- Pure, with the low maintenance to exhaust water of drinking quality.
- For a drain stopper on the block of cylinders the sealing ring And 14 x 18 is necessary aluminium.

Within the limits of maintenance service it is necessary to spend replacement of a cooling liquid each 4 years. Attention: the Cooling liquid in certain degree is poisonous, and it cannot be poured out simply. Local authorities should give the information on an arrangement of points of reception of similar materials.
The volume of system of cooling is resulted in Specifications.

Removal of a cooling liquid

Do not open a stopper at the hot engine. There is a danger of a burn! A stopper open only at temperature of a cooling liquid more low +90С. At stopper opening put on it a rag.


1 Cautiously open a stopper of a broad tank.

Operation of lifting and car installation on supports is connected with danger! Therefore before operation carrying out familiarise with Razdelom Poddomkrachivanie and towage


2 Lift and establish the car on supports. Remove the bottom cover of an impellent compartment, address to Section Removal and installation of the bottom cover of an impellent compartment.

3 Substitute under a radiator pure capacity and turn away a stopper below under a radiator, keeping thus an adjusting nut-2. Engines 316i, 318i have also a separate drain stopper-3 for a broad tank which is necessary for opening also.

4 In addition put capacity under the engine and turn out a drain stopper on the block of cylinders. The stopper is under a final collector.


5 Completely merge cooling liquid and utilise it according to an existing order.
6 Screw a drain stopper with a new sealing ring in the block of cylinders and tighten the moment 25 Н•м.
7 Screw a drain stopper on a radiator with new sealing slightly tighten its moment 2.5 Н•м.

Filling of system with a cooling liquid

8 Establish a heater in salon on the maximum capacity. The fan switch establish on a low step and include ignition. Thus, heater cranes open.

9 Open the union for release of air at the top of a radiator near to a broad tank.


10 Petrol engines: Fill a broad tank to edges with a fresh cooling liquid so that the liquid left without vials through the union for air removal. Close the union.

Unions tighten slightly the moment 2.5 НЧм.


The diesel engine 320d

11 Oslabte screws-1 also remove facing of the engine-2. On an illustration on both left screws there are face keys for internal шестигранника.

12 Oslabte the union for removal of air-1 on a system radiator recycling the fulfilled gases and the union-2 heat exchanger oil-water.

13 Oslabte the union of removal of air-1 on a heater hose.

14 Engine 320d with the conditioner: Loosen the the union for removal of air-1 on a hose going to the heat exchanger of a heater.


15 At the diesel engine it is necessary to observe necessarily the following sequence of filling of system a cooling liquid:

a) Slowly fill a broad tank with a liquid. Close the union-2 heat exchangers oil-water when through it the liquid will act.

b) Fill in a liquid further. Close the union-1 near to a broad tank when the liquid will act there.


c) Fill a broad tank with a liquid to edges.
d) Close the remained unions on a heater hose, a system radiator recycling and, in the presence of the conditioner, on a hose of the heat exchanger of a heater.

Through the specified unions at filling of system the liquid does not leave.


All engines:

16 Close a broad tank a stopper. It is not necessary to warm up the engine at an open stopper as it can lead to damages.
17 Start the engine and hold turns above 2500 rpm толчкообразными pressing a gas pedal. As a result of removal of air containing in cooling liquid level the liquid in a tank will slightly go down.
18 Switch off ignition.

Cooling liquid in system if necessary add only after engine cooling, otherwise after stopper removal there is a danger of a burn!


19 Check up liquid level on the cold engine and if necessary add, address to Section Check of levels of liquids.
20 Visually check up tightness of system of cooling, in particular, шланговых joinings, and also drain stoppers and unions of removal of air.

21 Diesel engine 320d: Establish and fix engine facing.