64 11 208 Replacing heater core

WARNING: This page is about a different car, the 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Determine manufacturer of installed heater (Denso or Behr) before ordering spare parts!
Remove trim panel for pedal assembly . See 51 45 185 REMOVING AND INSTALLING/REPLACING PANEL FOR PEDALS .

Fig 1: Locating Heater Core

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Necessary preliminary tasks:

Remove heater/air conditioner

Release screws (1).

Slide rubber grommet (1) with foam seal forward slightly.

Carefully feed pipe holder (3) with pipes (4) past rubber grommet (2).

Installation:

If necessary, replace rubber grommet (1) and/or foam seal.

Make sure rubber grommet (1) is correctly seated on pipe holder (3).

Fig 2: Identifying Feed Pipe Holder, Pipes And Past Rubber Grommet

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If necessary, remove coolant hose (2).

Release screws (3) and remove cover.

NOTE: Diesel version only:
Unfasten plug connection (1) and disconnect.
Withdraw electric auxiliary heater (4) in direction of arrow.

Remove heater (5) from heater/air conditioner (6).

Fig 3: Removing Heater And Air Conditioner

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Release screws (1) and slide screw clamps (2) forwards slightly.

Remove pipes (3) from heater core (4).

Installation:

Replace sealing rings.

Coat sealing rings with antiseize agent.

Make sure sealing rings are correctly seated.

Fig 4: Removing Pipes From Heater Core

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IMPORTANT: Inflow connection (3) may only be positioned at the bottom.
When installing, make sure that the return-flow connection (2) (larger opening) marked with a black dot (1) is positioned at the top.
Inflow connection (3) accordingly may only be positioned at the bottom.

Fig 5: Identifying Return Flow Connection

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