Removing and installing fresh air blower V2 with fresh air blower control unit J126 — AUDI

Removing and installing
fresh air blower
V2
with
fresh air blower control unit
J126
Note
V2
and
J126
form one component and are not to be dismantled
Electronic parts catalogue
.
Different versions of
V2
with
J126
are available as replacement parts. Pay attention to correct assignment
Electronic parts catalogue
.
J126
switches (with the ignition on and
V2
activated)
“Positive”
from contact
“3”
of the connector
C
to
V2
. The speed of
V2
is regulated by
J126
by way of the earth connection of the connector
C
contact
“1”
Vehicle diagnostic tester
in
“Guided Fault Finding”
mode and
Current flow diagrams, Electrical fault finding and Fitting locations
.
V2
is activated via
J126
by the air conditioner front operating and display unit,
Climatronic control unit
J255
by way of a local data bus to contact
“1”
in the connector
C
Vehicle diagnostic tester
in
“Guided Fault Finding”
mode and
Current flow diagrams, Electrical fault finding and Fitting locations
.
On vehicles with a sun roof with
solar cells
C20
(optional extra) with the ignition switched off and an adequate voltage at contact
“2”
in the connector
C
,
V2
is activated by way of
J126
. The voltage at contact
“2”
in the connector
C
is governed by the sunlight penetration acting on the
solar cells
C20
Chapter
“
Solar panel for sun roof
”
and
Owner's Manual
.
Removing
Move the front right seat (front passenger's seat) as far back as it will go.
Switch off ignition.
Remove the glove compartment
General body repairs, interior
Rep. gr.
68
Shelves/storage compartments/covers; Removing and installing glove compartment
.
Remove the right footwell vent (front passenger's side)
Chapter
.
Remove the screw-type clip
A
.
Unfasten the insulating mat
B
from the bracket
C
and detach.
Note
To facilitate installation, the glove compartment
D
is provided with lugs with hooks
A
which are engaged as shown in the insulating mat
B
openings on fitting. If the glove compartment
D
has not been correctly installed (lugs with hooks
A
pressing against insulating mat
B
from underneath), the insulating mat
B
can only be removed after taking out the glove compartment
General body repairs, interior
Rep. gr.
68
Shelves/storage compartments/covers; Removing and installing glove compartment
.
Release und unplug the connector
C
.
Note
To release the connector press down the catch using a small screwdriver for example.
Remove bolts
A
.
WARNING
The heat sink at the
fresh air blower control unit
J126
may be hot.
Caution
Do not grasp hold of the impeller of the
fresh air blower
V2
D
. Applying force to the impeller or moving the balancing weights attached to the impeller could cause imbalance and thus operating problems.
If
V2
cannot be removed from the air intake box without applying force, take out the air intake box together with
V2
Chapter
“
Removing and installing air intake box of front air conditioning unit
”
.
Note
Depending on the vehicle model (thickness and type of foam beneath the floor covering in the area of
V2
), it may not always be possible to remove
V2
from the air intake box and re-install it without squashing the impeller. Even brief application of force can however be sufficient to damage
V2
.
Remove the
fresh air blower
V2
(with the
fresh air blower control unit
J126
)
B
from the air intake box
E
.
Installing
Install in reverse order of removal; note the following.
Check the air intake box
E
for contamination by way of the slot for
V2
B
and clean if necessary.
On installation, pay attention to correct positioning of the
fresh air blower
V2
B
in the air intake box
E
.
Interrogate event memory of operating and display unit (
Climatronic control unit
J255
) and erase any entries displayed
Vehicle diagnostic tester
in
“Guided Fault Finding”
mode.
To check operation, perform air conditioner final control diagnosis
Vehicle diagnostic tester
in
“Guided Fault Finding”
mode.