BMW 5 series E39

Since 1996-2001 of release

Repair and car operation

+ Introduction
+ The maintenance instruction
+ Current leaving and service
+ The engine
- Systems of cooling, heating
   - Cooling system
      Check of system of cooling
      Removal, installation and thermostat check
      Removal and installation of the fan and муфты the fan
      Removal and installation of a broad tank
      Removal and radiator installation
      Removal and installation of the pump of a cooling liquid
   + Heater
   + Air conditioner
+ The 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

Removal, installation and thermostat check

The thermostat at increase of temperature of the engine connects the big contour of cooling. If the thermostat owing to damage remains closed, the engine overheats. A sign of it is the index of temperature which is in a red range. Thus cooling liquid remains cold. The faulty thermostat after liquid cooling can remain opened. A sign of it is the impossibility of achievement by the engine of working temperature or slower growth of temperature of a cooling liquid, than till now, and in the winter - falling of capacity of a heater.

If the engine heats up after small run of the car, pollution of a radiator owing to adjournment can be the reason also to exhaust.


Model 525tds

1 — the thermostat case
2 — a ventilation bolt
3 — the thermostat

4 — a sealing ring
5 — a bolt

Models 520i, 523i, 528i

1 — the thermostat case
2 — the thermostat
3 — a sealing ring

4 — consolidation
5 — bolt М6
6 — bolt М8


1. Remove the fan, address to Section Removal and installation of the fan and муфты the fan.
2. Merge cooling liquid, address to Section Replacement of a liquid of system of cooling. Check of frost resistance of a cooler. Visual check of system of cooling.
3. Disconnect hoses from the thermostat case (from the forward party of the block of cylinders). For this purpose open collars.

4. Models 520i, 523i, 528i: Remove from the engine elevating eyes. Disconnect mine of a cable at clips and remove. Address to an accompanying illustration.

5. Turn away a thermostat cover.

Fastening bolts have various length, it is recommended to write down their length.

6. Pay attention to position of the thermostat and take out it.


1. Heat up the thermostat in capacity with water. Thus the thermostat should not concern capacity walls. The temperature is measured by the corresponding thermometer. Address to an accompanying illustration.

2. At temperature nearby +88С заслонка the thermostat starts to open. The opening beginning is visible on the thermostat.
3. Check up, whether the thermostat extends and whether is closed, and also whether the beginning of opening coincides with the established value specified on the thermostat. If necessary replace the thermostat.


1. Clear sealing surfaces on the case and a cover.

2. Models 520i, 523i, 528i: Insert the thermostat into a head of cylinders so that the arrow showed upwards. Address to an accompanying illustration.

3. 525tds: insert the thermostat so that the ventilating valve showed upward. The arrow is in a cover groove. Address to an accompanying illustration.

4. Slightly grease a sealing ring of the thermostat with glycerine and establish it, address to an illustration in subsection "Removal".
5. 520i, 523i, 528i: a paper lining it is necessary to establish the new necessarily.
6. Establish the case of the thermostat and in regular intervals wrap fastening bolts the moment specified in Specifications.

Do not tighten bolts too strongly. Do not forget to establish load-lifting eyes at the 6-cylinder engine.

Bolts of fastening of an eye (М8) tighten the moment of 20 Nanometers.

7. Fix mine of a cable clips.
8. Establish the fan and a fan cover.
9. Fill system with a liquid and remove air, address to Section Replacement of a liquid of system of cooling. Check of frost resistance of a cooler. Visual check of system of cooling.
10. Start and warm up the engine so that вязкостной муфты has connected the fan. Check up, whether the radiator in the bottom part has got warm and check up tightness of the case of the thermostat. At presence негерметичности tighten fastening bolts.