BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
- Cooling systems, heating
   - Cooling system
      Check of the cooling system
      Removal, installation and check of the thermostat
      Removal and installation of the fan and coupling of the fan
      Removal and installation of a broad tank
      Removal and installation of a radiator
      Removal and installation of the pump of cooling liquid
   + Heater
   + Air conditioner
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics

Check of the cooling system

Leakage in the cooling system and operation of the safety valve in a stopper of a broad tank can be checked ordinary technical means.


1. Warm up the engine up to the working temperature. For this purpose pass on the car so that the index of temperature of cooling liquid showed normal working temperature.
2. Check the level of cooling liquid, if necessary add liquid.
3. Open a stopper of a broad tank.

At the warmed engine before opening of a cover of a radiator put on it a thick rag to exclude a burn owing to emission of hot liquid and steam. There is a danger of accident. The cover can be opened only at a temperature of cooling liquid below +90 °C.

4. Install through an adapter on a branch pipe for filling of cooling liquid of a broad tank the device for tightness check. The manual pump of the device create pressure about 1.0 bars. If during two minute pressure drops more, than by 0.1 bars, find leakage and eliminate it. A sign of the defective place is the liquid following from it. Address an accompanying illustration.

5. If pressure of liquid falls without effluence of liquid or even rises, then, for example, damage of sealing laying of a head of cylinders or a crack to the case can be the cause.
6. For check of the safety valve in a stopper of a radiator install on it the device for check. Create pressure the manual pump. At pressure of 2.0 bars the safety valve has to open. Otherwise replace a stopper.
7. Create depression in a radiator. At depression of 0.1 bars the vacuum valve in a stopper of a radiator has to open.