Audi Q7 2007 Repair Manual page 52

Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
Note
If the belt pulley overload protection activates, check the A/C
♦
compressor for ease of movement before replacing the belt
pulley. If the A/C compressor creates friction, replace it com‐
pletely.
To remove belt pulley, it depends on engine version if it is
♦
necessary to remove A/C compressor from engine. Depend‐
ing on the engine version, the A/C compressor can be re‐
moved and re-installed from the auxiliary components bracket
without opening the refrigerant lines.
For example, on a vehicle with a 6-cylinder engine, the A/C
♦
compressor can be removed and installed at the bracket with‐
out opening the refrigerant lines. Refer to
⇒ "3.7 Compressor on Bracket, Removing and Installing",
page 27 .
Belt pulley is made of plastic and is sensitive to impact, there‐
♦
fore handle it with especial care.
Mark direction of rotation of ribbed belt using chalk or felt-tip
♦
marker before removing. Running a used belt in the opposite
direction could destroy it.
If the drive plate -C- overload protection activates, rotate the
♦
pulley -E- using the outer part of the drive plate -C- so that the
A/C compressor shaft -B- and the hexagon head on the drive
plate -D- (inner part of the drive plate -C-) do not rotate.
The belt pulley and the drive plate are held together with one
♦
bolt (when the bolt is no longer needed, dispose of it). Refer
to the Parts Catalog.
When the bolt was manufactured, a predetermined amount of
♦
a specific grease was applied to the threads in the drive plate;
this amount is sufficient for bolting the drive plate to the A/C
compressor one time (a drive plate, which has been removed,
cannot be reused).
Depending on the version of the engine, it may be necessary
♦
to bring the lock carrier -C- into the service position (pulled
approximately 10 cm forward) so there is enough space to re‐
move the belt pulley. Refer to ⇒ Body Exterior; Rep. Gr. 50 ;
Body Front .
Removing
– Remove the noise insulation on vehicles with a 6-cylinder en‐
gine or a 12-cylinder TDI engine. Refer to ⇒ Body Exterior;
Rep. Gr. 66 ; Underbody Trim Panels .
– Move the lock carrier -C- into the service position (for example,
on a 12-cylinder TDI engine). Refer to ⇒ Body Exterior; Rep.
Gr. 50 ; Body Front .
– Release tension on ribbed belt and remove it. Refer to ⇒ En‐
gine Mechanical; Rep. Gr. 13 ; Cylinder Block, Belt Pulley
Side .
– If necessary, remove the power steering pump (only on vehi‐
cles with a 6-cylinder gasoline engine). Refer to ⇒ Suspen‐
sion, Wheels, Steering; Rep. Gr. 48 ; Power Steering Pump,
Hydraulic Pipes and Reservoir .
46
Rep. Gr.87 - Air Conditioning
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with respect to the correctness of information in this document. Copyright by AUDI AG.