64 11 208 Replacing heater core

WARNING: This page is about a different car, the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, and 2007 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Scalding hazard! Work on the cooling system may only be carried out when it has cooled down.

Necessary preliminary tasks:

Remove microfilter housing .
Remove instrument panel trim. See 51 45 030 REMOVING AND INSTALLING INSTRUMENT PANEL TRIM .

Recycling: Coolant emerges when coolant hoses are detached. Have a suitable collecting container ready. Catch and dispose of escaping coolant. Observe country-specific waste-disposal regulations.

Detach hot water hoses (1) from heater and blow coolant out of heater core.

Fig 1: Detach Hot Water Hoses (1) From Heater

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: For purposes of clarity, the following operations are shown on the removed heater core.

Pull out temperature sensor (1) and unclip wiring harness (2) from holder.

Fig 2: Pull Out Temperature Sensor (1) And Unclip Wiring Harness (2) From Holder

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: Ensure correct lead routing.

Release screw (1) and remove bracket (2) from double pipe. Unclip retainers (3) and lift off cover for heating element (4).

Fig 3: Release Screw (1) And Remove Bracket (2) From Double Pipe

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: First insert lugs (5).

Remove retainers (1) and remove double pipe (2) towards top. Raise heater core (3) at front and remove.

Fig 4: Remove Retainers (1) And Remove Double Pipe (2) Towards Top

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: Replace sealing rings, coat with anti-friction agent and make sure sealing rings and lines are correctly seated.

After installation: Venting cooling system and checking for water leaks. See 00 COOLANT, CHECKING COOLING SYSTEM .