Removing And Installing/Replacing Heater (Automatic Air Conditioner)

Removing And Installing/Replacing Heater (Automatic Air Conditioner)

Draw off, evacuate and fill A/C system.
Remove heater bulkhead.

S54 only:
Remove intake air manifold.


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







Release hose clamps (1) and (2).
Detach water hoses.
Carefully blow through lines to remove remaining coolant from heating element.

Installation: Filling and bleeding the cooling system,







Release screw.







Unfasten screws.
Remove pressure and intake pipes.

Installation: Replace sealing rings.







If necessary, release unlocking mechanism and remove circulating air flap.







Release nut (1) and lay double pipe (2) to one side.

Installation: Replace sealing rings.







Release screws (2) on bulkhead (1).







Remove panel for instrument panel. Service and Repair
Remove complete storage tray.
Release shear screw (1) (e.g. mill oft or rebore screw head).
Unscrew bolt (2).







Release screws and lower steering column.







Release screw.







Detach door seal (1) and trim (2) on A-pillar on left and right in direction of arrow.







Unfasten transverse reinforcement on right and left.







Release head airbag on transverse reinforcement on right and left.







Disconnect heater plug connections.







Unfasten transverse reinforcement on right and left sides of center console.







If necessary, cut open cable ties (1).
Turn lock (2) on left and right on fuse box through approx. 90° and fold down fuse box.







Disconnect pivot (1) of fuse box on left and right at transverse reinforcement towards top.
Remove transverse reinforcement.
Remove heater - A/C unit.

Installation Note: Make sure condensate drain is correctly seated.