Left Heater Core Housing With Temperature Doors

Left Heater Core Housing with Temperature Doors

• The activation of the temperature doors and with it the heater core housing with the left temperature doors is different between vehicles equipped with "Comfort" and "Basis" A/C systems. Refer to => [ Air Distributor Housing Doors and Partitions ] Air Distributor Housing Doors and Partitions and to the Parts Catalog.

• To maintain the A/C stability, only one heater core housing (the left or right side) may be removed with the A/C installed.

• Depending on the production date, there are different versions of the levers and connections on the A/C unit. Refer to => [ Air Conditioner, Levers and Connecting Elements ] Air Conditioner, Levers and Connecting Elements and the Electronic Parts Catalog (ETKA).

Do not remove the left and right heater core housing at the same time.

• Both heater core housings support components of the air conditioner must not be removed at the same time. Otherwise the air conditioner will become unstable.

• If necessary, remove the left and right heater core housing one after the other.

Removing

- Switch on the ignition.

- Move the driver seat as far back as possible.

- Turn off the ignition.

- Remove the storage compartment under the dash panel on the driver side.

- Remove the left footwell vent (driver side). Refer to => [ Left Footwell Vents ] Left Footwell Vents.

- Remove the steering column.

- Remove the pedal assembly and accelerator pedal module.

- On a vehicle equipped with the "Comfort" A/C system, remove the retaining plate together with the left footwell door motor (V108) and the left center vent motor (V110) as well as the left temperature door motor (V158). Refer to => [ Left Retaining Plate with Left Footwell Door Motor (V108) and Left Center Vent Motor (V110) ] Left Retaining Plate With Left Footwell Door Motor (V108) and Left Center Vent Motor (V110) and => [ Left Temperature Door Motor (V158) ] Left Temperature Door Motor (V158).

- On a vehicle equipped with the "Basis" A/C system, remove the retaining plate together with the Footwell Door Motor (V261). Refer to => [ Left Retaining Plate with Footwell Door Motor (V261) ] Left Retaining Plate With Footwell Door Motor (V261).

- Remove the glove compartment.

- Remove the right (passenger) footwell vent. Refer to => [ Right Footwell Vent ] Right Footwell Vent.

- Carefully disconnect the connector rod - B - (so the lever does not get damaged) from the lever on the right temperature door - A -.






- Loosen the bolt - C -.

- Loosen or remove the bolt - F - (installed beginning 07.2007, different versions).






• At the start of production, A/C units were installed, where the left and right side of the heater core housing - D - and - E - were bolted together on the underside with the bolt - C -. Beginning 07.2007 as a running change, A/C units are being installed, where both heater core housings - D - and - E - are bolted together with the bolt - F -.

• From 07.2007 through 09.2007 and screw - F - and nut - G - was installed on the left heater core housing - D -. The left heater core housing - D - has a single hole and not a threaded connection. To remove and install the bolt - F - and the nut - G - on this control motor version, the Temperature Regulator Door Motor (V68) or the Rear Temperature Door Motor (V137) must be removed. Refer to => [ Temperature Regulator Door Motor (V68) and Rear Temperature Door Motor (V137) ] Temperature Regulator Door Motor (V68) and Rear Temperature Door Motor (V137).

• You can place a catch on the holes on the right side of the heater core housing - E - which will prevent the bolt - C - (and the bolt - F -) from falling in the hole after being loosened.

- Carefully disconnect the connector rod - A - (so the lever does not get damaged) from the lever on the defrost door - B -.






- Remove the screw - C -.

- Remove the left heater core housing - D - (together with the Defroster door Motor (V107) and Temperature regulator door motor (V68) or the Rear temperature door motor (V137) ) from the A/C. When doing this, pay attention to the lever on the defrost door - B - (and the lever on the door for the left center dash panel vent - E - on vehicles equipped with the "Comfort") A/C system).

Installing

Installation is carried out in the reverse order while observing the following.

- Check the groove - A - on the left heater core housing - F - and the spring on the A/C - B - for damage.






• If the groove - A - on the left heater core housing - F - or the spring on the A/C unit - B - are damaged, seal these with, for example, Silicone Adhesive D176 001 A3. Refer to Electronic Parts Catalog (ETKA).

- Check the heater core - C - and evaporator - D - for dirt; clean if necessary.

- Check the foam seals on the heater core - C - and on the Auxiliary Air Heater Heating Element (Z35) (or on the honey comb on vehicles without an Auxiliary Air Heater Heating Element) for damage.

- Insert the grooves - A - on the left heater core housing - F - into the springs on the A/C unit - B - and push the left heater core housing - F - into the A/C unit.

• Pay attention to the connector rod to the right temperature door - E - and the lever on the defroster door - G - (and the lever on the door for the left center dash panel vent on vehicles equipped with the "Comfort" A/C system).

- Install the removed parts in the opposite order.

- Switch on the ignition.

- Perform a basic setting and the output Diagnostic Test Mode (DTM) on the A/C system using the Vehicle diagnostic tester in "Guided Fault Finding".

• On this vehicle, the control motors are equipped with electronics. During the first basic setting, a new control motor learns its position on the air conditioner and can then be controlled by the Climatronic Control Module (J255) (currently all control motors are identical). Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

• During the basic setting, the control motors are assigned and adapted corresponding to the switching sequence of the wiring. If this sequence does not conform the specification, the control motors will adapt incorrectly and the door control will be wrong. Refer to => [ A/C Control Motor Block Diagram ] A/C Control Motor Block Diagram.

- Check the Climatronic Control Module DTC memory and erase any displayed malfunction if necessary using the Vehicle diagnostic tester in "Guided Fault Finding".