15.1. Removal, check of work and installation of a heater and conditioner of air


The retro model (E28) use two separate motors of superchargers: one for ventilation and heating. And another for air conditioning. Modern models (E34) have one motor of the supercharger. Removal and installation of the only motor of the supercharger, and also motor for ventilation and heating of the retro models are described below. Removal and installation of the motor of the supercharger for air conditioning of the retro models are described in the Section Removal and installation of an accumulator/dehydrator of the air conditioning system of this Chapter.

If the radio receiver of your car is equipped with system of protection against theft, make sure that you gathered the correct code before a battery detachment.

If after connection of the battery of an inscription on an instrument guard appeared not in that language, address the Section System of protection of the audio system against theft and language of an instrument guard where the procedure of installation of the necessary language is described.


  1. Disconnect a negative wire of the battery.
  1. The motor of the supercharger is located behind a partition, under the access panel. Give screws of fastening of the panel in front...

... and fastening from above hold this panel

  1. Disconnect or cut off the plastic fastenings holding conducting on the panel and take conducting aside.
  2. Remove the panel.
  1. Undo a fixing clip of a casing of the supercharger, and also the clip holding the motor of the supercharger.
  1. Disconnect conducting and remove the motor of the supercharger.


You can check the motor of the supercharger, having given tension from the battery on motor plugs, having used the integrated wires from a set for start of the car from an external source (make sure that blades of the fan will not touch anything at rotation). If the motor of the supercharger rotates fan blades with the high speed (this test is calculated on its high-speed work), then it means that it is serviceable. If the motor does not work, either works slowly or is noisy, replace it.

If it is necessary to remove assemblies of blades of the fan, mark their arrangement on a shaft. At the plant these assemblies were balanced and if not to establish them in just the same situation in relation to a shaft, it can lead to excessive noise during their work or to premature wear of bearings.


You make installation upside-down.

For the correct installation of a fixing clip, perhaps, it will be required to turn the motor of the supercharger.