BMW 3 Series E46

since 1998 release

Repair and operation of the car

BMW 3 Series E46
+ BMW 3 cars (E46)
- Current leaving and service
   Current leaving
   General information on control
   Check of levels of liquids
   Check of a condition of tires and pressure in them. Designation of tires and disks of wheels
   Replacement of motive oil and oil filter
   Replacement of the filtering element of the air filter
   Checks of the brake system
   Replacement of an element of the filter of air of salon
   Check of a condition of driving ridge belts
   Check of a state and replacement of hoses of a motive compartment
   Check of functioning of the cooling system and frost resistance of cooling liquid
   Check of a condition of system of production of the fulfilled gases
   Check of level of oil in a manual box of gear shifting
   Check of a condition of components of a suspension bracket and steering
   Check of a condition of protective covers of power shafts
   Check of level of liquid of system of hydrostrengthening of a wheel
   Visual check of a body and its bottom
   Check of seat belts
   Rotation and replacement of wheels
   Check of a state, replacement of brushes and adjustment of a corner of screen wipers
   Check of a condition of the battery, care of it and charging
   Replacement of brake fluid
   Check and replacement of spark plugs
   Check of fuel system, replacement of the fuel filter. Operation of diesel model in the conditions of winter
   Greasing of loops and locks of doors
   Replacement of the battery of a key of remote control
+ Engine
+ Cooling systems, heating
+ 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
+ Schemes of electric equipment

Check of functioning of the cooling system and frost resistance of cooling liquid

1 Many serious violations in operation of the engine are connected with malfunctions of the cooling system. If the car is equipped with automatic transmission, then its functioning and service life are also directly connected with operation of the cooling system.
2 Check of the cooling system has to be made at the cold engine therefore it is better to be engaged in it before a trip, the first for the present day, or not earlier than in three hours after switching off of the engine.
3 Slowly, being careful in case the engine yet not absolutely cooled down, uncover a radiator. Carefully wash out it clear water from within and outside. Also wash out a jellied mouth of a radiator. Existence of traces of corrosion in a jellied mouth means that the cooler should be replaced (address the Section Replacement of Cooling Liquid). The cooler in a radiator has to be rather pure and transparent. If it has brownish color, drain system and fill in in it a new cooler.
4 Carefully check radiator hoses, and also heater hoses which have smaller diameter. Check cooling system hoses on all length, making replacement of any burst, blown up or worn-out hose. It is easier to find cracks if to squeeze a hose a hand. Pay special attention to the collars holding hoses on cooling system components. These collars can cut or pierce hoses that will lead to leakage of a cooler.


5 Make sure of reliability of fastening of all hose connections. Leakages of a cooler are usually shown in the form of white or rusty color of deposits in the field of sealing violation. If on your car collars of wire type are used, then it is possible, there is a sense to replace them with collars of screw type.
6 By means of compressed air or a soft brush clear a forward part of a radiator (and also the air conditioner condenser where it is available). Remove all insects, the leaves and other foreign objects which got on radiator edges. Be very careful not to injure an edge and not to cut about them fingers.
7 If cooler level constantly falls, and you did not find any leaks, it is necessary to make check by pressure of a cover of a radiator and all cooling system.

Check of frost resistance of cooling liquid

Do not allow hit of antifreeze on your skin and the painted surfaces of the car. At hit immediately wash away a plentiful amount of water. Antifreeze is extremely toxic and deadly at hit in an organism. Do not leave antifreeze in an open container or spilled on a floor; its sweetish smell can easily attract to itself children or pets. Consult about local rules of utilization of the fulfilled antifreeze. In many areas there are special centers for its acceptance.

Before a winter season it is necessary to check surely concentration of antifreeze in cooling liquid, especially if in system clear water was in use filled in.

For this purpose the frost resistance measuring instrument will be required. There is also optical tool for check of the HAZET level No. 4810.


8 Slightly warm up the engine so that the top hose of a radiator heated up. At measurement of concentration of antifreeze temperature of liquid has to be close to +20 °C.

On the hot engine the stopper of a broad tank should be opened carefully. There is a danger of a burn! It is necessary to put a rag on a stopper. Open a stopper only at a temperature of liquid no more than +90 °C.

9 Carefully turn off a stopper of a broad tank.

10 Gather liquid by means of an areometer pear.

11 In our latitudes the concentration of antifreeze providing protection of system up to the temperature of -25 °C at especially frigid climate to –35 °C is sufficient.

Antifreeze addition

Address materials of Specifications at the beginning of the Head.

In need of ensuring frost resistance up to the temperature of -25 °C concentration of antifreeze in cooling liquid has to make 40%.

In need of ensuring frost resistance up to the temperature of -35 °C concentration of antifreeze has to make 50%.

If higher degree of protection against freezing is required, it is possible to increase the level of concentration of antifreeze to 60%. Such concentration will provide protection to –40 °C. If concentration increases to higher level, degree of protection of the engine begins to go down and, besides, heat-removing properties of a cooler worsen.

12 Remove necessary quantity of a cooler and add antifreeze according to data of Specifications.
13 Close a stopper on a radiator and after a trial trip check concentration of antifreeze again, address Specifications.