Right Heater Core Housing, Motor Mounting Plate Removed
Right Heater Core Housing, Motor Mounting Plate Removed
• From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed => [ Glove Compartment Cooling to Air Intake Manifold Connection ] Glove Compartment Cooling to Air Intake Manifold Connection. Make sure the correct right radiator housing and air intake hosing (different versions) are installed. Refer to Electronic Parts Catalog (ETKA).
• The activation of the temperature doors and with it the right radiator housing is different between vehicles equipped with "Comfort" and "Basis" A/C systems. Refer to => [ A/C Unit and Air Intake Housing Components ] A/C Unit and Air Intake Housing Components and to the Parts Catalog.
• To maintain the A/C stability, only one radiator 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 to Electronic Parts Catalog (ETKA).
• Vehicles with the "Comfort" A/C system can have the right radiator housing and the mounting plate installed/removed for the motors removed/installed. Vehicles with the "Basis" A/C system do not have this mounting plate.
Do not remove the left and right radiator housing at the same time.
• Both radiator housings support components of the air conditioner and must not be removed at the same time. Otherwise the air conditioner will become unstable.
• If necessary, remove the left and right radiator housing one after the other.
• Vehicles with "Basis" A/C system (no motor mounting plate).
• Vehicles with "Comfort" A/C system where the right mounting plate and motors and the right heater core housing must be removed one after the other.
Removing
- Switch on the ignition.
- Set the air flow direction to "DEF" on the Climatronic control module (J255).
- Move the passenger seats as far back as possible.
- Turn off the ignition.
- Remove the air intake housing. Refer to => [ A/C Unit Air Intake Housing ] A/C Unit Air Intake Housing.
Vehicles with "Comfort" A/C system.
- Remove the right footwell door motor (V109) and right center vent motor (V111). Refer to => [ Right Retaining Plate with Right Footwell Door Motor (V109) and Right Center Vent Motor (V111) ] Right Retaining Plate With Right Footwell Door Motor (V109) and Right Center Vent Motor (V111).
Vehicles with "Basis" A/C system.
- Remove the center vent adjustment motor (V102). Refer to => [ Center Vent Adjustment Motor (V102) ] Center Vent Adjustment Motor (V102).
All vehicles
- Disconnect the connector from the Evaporator Vent Temperature Sensor (G263). Refer to => [ Evaporator Vent Temperature Sensor (G263) ] Evaporator Vent Temperature Sensor (G263).
- Carefully disconnect the connector rod - B - (so the lever does not get damaged) from the lever on the right temperature door - A -.
• 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).
- 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.
- On a vehicle equipped with the "Comfort" A/C system, mark the connector - A - (to prevent confusing it with other connectors) and remove.
• The Right Temperature Door Motor (V159) is installed only on vehicles equipped with the "Comfort" A/C system.
- Remove the screw - B -.
- Remove the screw - C -.
• The bolt - C - , on vehicles equipped with the "Comfort" A/C system, was already moved when the Right Footwell Door Motor (V109) and the Right Center Vent Motor (V111) were removed.
- Remove screws - D -.
- On vehicles equipped with an auxiliary air heater heating element (Z35) loosen the cables - G - from the right heater core housing - E -. Refer to => [ Auxiliary Air Heater Heating Element (Z35)/Honey Comb ] Service and Repair.
- Disconnect the right heater core housing - E - (together with the Right Temperature door Motor (V159) ) from the A/C unit; when doing this, pay attention to the lever on the door for the dash panel vents - F - ("right center" on vehicles equipped with the "Comfort" A/C system, or "center" on vehicles equipped with the "Basis" A/C system).
Installing
Installation is carried out in the reverse order while observing the following.
- Check the heater core - A - and evaporator - B - for dirt; clean if necessary.
- Check the foam seals on the heater core - A - and on the Auxiliary Air Heater Heating Element (Z35) - C - (or on the honey comb on vehicles without an Auxiliary Air Heater Heating Element) for damage.
- Check the springs on the A/C unit - B - and the grooves - A - on the right heater core housing - C - for damage.
• If the groove - A - on the right heater core housing - C - 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).
- Insert the grooves - A - on the right heater core housing into the springs on the A/C unit - B - and push the right heater core housing - C - into the A/C unit.
• On vehicles equipped an Auxiliary Air Heater Heating Element pay attention to the wiring - D - when installing the housing - C -.
• Pay attention to the lever on the door for the dash panel vents - F - ("right center" on vehicles equipped with the "Comfort" A/C system or "center" on vehicles equipped with the "Basis" A/C system).
- Install the bolts - B - and - C -.
- 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".