S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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‹› If the groove - A - on the left radiator housing - F - or the spring on the A/C unit - B - are damaged, seal these with, for example, Silicone
Adhesive D176 001 A3.
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Check the heat exchanger - C - and evaporator - D - for dirt; clean if necessary.
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Check the foam seals on the heat exchanger - C - and on the Auxiliary Air Heater Heating Element (Z35) (or on the honey comb on vehicles
without an Auxiliary Air Heater Heating Element (Z35)) for damage.
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Insert the grooves - A - on the left radiator housing - F - into the springs on the A/C unit - B - and push the left radiator 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).
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Install the removed parts in the opposite order.
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Perform a basic setting and the output Diagnostic Test Mode (DTM) on the A/C system. refer to Vehicle Diagnosis, Testing and Information
System VAS 5051 in "Guided Fault Finding" function.
‹› 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 A/C Control Head Climatronic Control Module (J255) (currently all control motors are identical).
Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
‹› During the basic adjustment, 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 => [ Climatronic Control
Module ] See: Description and Operation/A/C System Control.
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Check the A/C control head Climatronic Control Module (J255) DTC memory and erase any displayed malfunction if necessary. Refer to Vehicle
Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
