E39 series BMW 5

since 1996-2001 of release

Repair and car operation

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
- Systems of cooling, heating
   - Cooling system
      Check of system of cooling
      Removal, installation and thermostat check
      Removal and installation of the fan and fan coupling
      Removal and installation of a broad tank
      Removal and radiator installation
      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
+ electric equipment Schemes
+ System of onboard diagnostics

Check of system of cooling

The leakage in system of cooling and work of a safety valve in a stopper of a broad tank can be checked usual means.


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

At the warmed-up 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 temperature of cooling liquid below +90°С.

4. Establish 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 bar. If within two minutes pressure falls more, than to 0.1 bar, find a leakage and eliminate it. A sign of a defective place is liquid following from it. Address to an accompanying illustration.

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