Audi Q7 2007 Repair Manual page 171

Note
There are different versions for vehicles with and without the
♦
parking/auxiliary heater. Refer to the Parts Catalog.
From 11/2007, the "Comfort" A/C system has an updated
♦
Fresh Air Blower Control Module - J126- (an updated Clima‐
tronic control module - J255- front A/C control head for the
"Comfort" version and an updated Fresh Air Blower - V2- ). For
the correct allocation, refer to the Parts Catalog.
Through 11/2007, vehicles with an A/C system, regardless of
♦
the version, always have a Fresh Air Blower Control Module -
J126- -D- part number "7L0 907 521", a Fresh Air Blower - V2-
part number "7L0 820 021" each with different indexes and a
Climatronic Control Module - J255- front A/C control head part
number "4L0 820 043" through index "J". Refer to the Parts
Catalog.
From 11/2007, vehicles with the "Comfort" A/C system, as a
♦
running change, have a Fresh Air Blower Control Module -
J126- -D- part number "3C0 907 521" beginning with index "B",
a Fresh Air Blower - V2- part number "4LX 820 021" with dif‐
ferent indexes and a Climatronic Control Module - J255- front
A/C control head part number "4L0 820 043" starting with index
"K" (there are no changes to the "Basis" A/C system). Refer to
the Parts Catalog. Pay attention to the correct allocation when‐
ever replacing one of these components.
The Fresh Air Blower Control Module - J126- , part number
♦
"3C0 907 521" starting with index "B" switches from contact "4"
on terminal -C- to contact "1" on terminal -B- when the ignition
is on and the Fresh Air Blower - V2- "Positive". The Fresh Air
Blower - V2- speed is regulated by the Fresh Air Blower Con‐
trol Module - J126- via the ground connection between termi‐
nal "2" of connector -B- and terminal "3" of connector -C-. Refer
to Wiring diagrams, Troubleshooting and Component loca‐
tions and use the Vehicle Diagnostic Tester via the "Guided
Fault Finding" function.
WARNING
The heat sink may be hot.
Removing
– Switch off ignition.
– Remove the glove box. Refer to ⇒ Body Interior; Rep. Gr. 68 ;
Storage Compartments and Covers .
Continuation for version "1"
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Heating, Ventilation and Air Conditioning - Edition 04.2013
9. A/C System Control Components Inside Passenger Compartment
Audi Q7 2007 ➤
165