64 11 208 Replacing Heat Exchanger

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. 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. Refer to PANEL FOR PEDALS (Coupe) or PANEL FOR PEDALS (Convertible).

Fig 1: Identifying Heater Core

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Necessary preliminary tasks:

Remove heater/air conditioner. Refer to REMOVING AND INSTALLING/REPLACING HEATER .

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: Sliding Rubber Grommet With Foam Seal Forward

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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: Identifying Coolant Hose & Heater/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 anti-seize 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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