Heater And A/C Unit Air Intake Housing, Removing And Installing: Installing

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

-- Check the evaporator -A- and the air guide in the A/C unit leading to the evaporator -B- for dirt and clean, if necessary.

Fig 1: Checking Evaporator And Air Guide For Cleanliness

Courtesy of AUDI OF AMERICA, LLC

-- Check the dust and pollen filter and the air guide in the air intake housing leading to the A/C unit -C- for dirt and clean if necessary.

-- Check the groove around the A/C unit -D- and the bevel around the air intake housing -E- for damage.

NOTE:

If the groove or the bevel are damaged, fill the damaged spot with, for example, silicone sealant D176 001 A3 . When using the A/C system, air could leak from here and this could result in noises.

-- Check the seal on the fresh air intake shaft -A- for damage before installing the air intake housing -C-. Replace the seal if it is damaged.

Fig 2: Checking Seal On Fresh Air Intake Shaft For Damage Before Installing Air Intake Manifold

Courtesy of AUDI OF AMERICA, LLC

-- Check the position of the lock, only if the latch -B- is in the position shown, can the air intake housing -C- and the A/C unit -D- be joined together.

-- According to the markings, connect the connectors to the Airflow Door Motor -V71- -E- and to the Recirculation Door Motor -V113- -F- with the actuators.

Fig 3: Inserting Both Lower Air Intake Housing Straps Into Mounting Points

Courtesy of AUDI OF AMERICA, LLC

-- Insert both lower air intake housing tabs -A- into the A/C unit mounting points -B-.

-- Lift the air intake housing to the right far enough so that the upper A/C unit tab -C- fits into the air intake housing bracket -D- and then press both parts together.

CAUTION:

Do not use force when attaching the air intake housing to the A/C unit.
If you use force to attach the air intake housing to the A/C unit, the tabs on the air intake housing -A- will bend.
If the tabs on the air intake housing -A- bend, the A/C system will make a whistling noise when it is running due to the slight air leakage.

NOTE:

If the latch -E- should slip forward while installing, both parts cannot be joined together

When joining the two parts together, make sure no other components get jammed in and that the bevel on air intake housing fits into the groove on the A/C unit all around.

-- Slide the latch -C- opposite the direction of the -arrow- (this locks the A/C unit with the air intake housing -B-).

Fig 4: Locating Cables From Mounting Points On Air Intake Housing

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-- Loosen the cables -A- into the mounting points on the air intake housing.

NOTE:

When routing the wires, make sure that they are routed on the actuators so that they cannot get caught in any moving parts on the actuators.

-- Reinstall the removed parts in the opposite order.

-- Turn on the ignition.

-- Perform a basic setting and the output diagnostic test mode for the A/C system using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

NOTE:

On this vehicle, the actuators are equipped with electronics. During the basic setting, a new actuator learns its position on the A/C unit and can then be activated by the Climatronic Control Module -J255- A/C display and control head (currently all actuators are identical) using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

During the basic setting, the actuators are assigned and adapted corresponding to the switching sequence of the wiring. If this sequence does not conform the specification, the adjustment motors will adapt incorrectly and the door control will be wrong. Refer to MAIN WIRING DIAGRAM FOR A/C SYSTEM ACTUATORS (A/C system actuators block diagram).

Make sure then both actuators, the Airflow Door Motor -V71- and the Recirculation Door Motor -V113- are attached correctly on the wiring. Check the activation using the "A/C system output diagnostic test mode". When the glove compartment is removed, the air recirculation door - F- is visible using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

Fig 5: Disconnecting Control Motor From Air Recirculation Door Shaft

Courtesy of AUDI OF AMERICA, LLC

-- Check the DTC memory of Climatronic Control Module -J255- display and control head and, if necessary, erase any errors displayed using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.