64 11 208 Replacing heater core (automatic A/C)

WARNING: This page is about a different variant/trim than selected.

Remove heater bulkhead. Refer to 51 71 080 REMOVING AND INSTALLING/REPLACING HEATER BULKHEAD .

WARNING: Danger of scalding!
Only perform this work after engine has cooled down.

Release hose clamps (1).

Fig 1: Detaching Water Hoses From Flange

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Detach water hoses (2) from flange (3). Carefully blow through lines to remove remaining coolant from heating element.

Installation:

Fill and vent cooling system. Refer to 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (M62) .

Remove trim panel for instrument panel. Refer to 51 45 030 REMOVING AND INSTALLING INSTRUMENT PANEL TRIM .

Unclip air duct for left footwell (2) at mountings (1) and remove in direction of arrow.

Fig 2: Removing Air Duct For Left Footwell

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Loosen screws (1).

Remove left footwell vent (2) in direction of arrow.

Fig 3: Removing Left Footwell Vent

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Loosen screws (1).

Fig 4: Pulling Out Pipes

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Pull out pipes (2) in direction of arrow.

Installation:

Replace sealing rings.

Unhook holder (1).

Fig 5: Removing Heating Duct For Right Footwell

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Unclip heating duct for right footwell (2) and remove in direction of arrow.

Installation:

Ensure heating channel for right footwell (2) is correctly seated.

Unclip air duct for rear footwell on right (1) and pull out in direction of arrow.

Fig 6: Removing Air Duct For Rear Footwell On Right

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Cover air duct underneath.

NOTE: For purposes of clarity, the following shows the heater/air conditioner removed.

Unclip clip (1).

Fig 7: Pulling Out heating Element Cover

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Loosen screws (2).

Pull heating element cover (3) in direction of arrow out of guide.

Installation:

Make sure guide is correctly seated.

Fig 8: Installing Guide

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Pull out evaporator temperature sensor (1) in direction of arrow and set to one side.

Fig 9: Pulling Out Evaporator Temperature Sensor

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If necessary, remove servodrive of footwell flap and footwell flap (2) in direction of arrow. Refer to 64 11 839 REPLACING SERVODRIVE OF FOOTWELL FLAP (AUTOMATIC A/C) .

Pull out heater element (3) in direction of arrow.

CAUTION: Do not bend cooling fins.
If necessary, clean or align cooling fins with fin comb.