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– Remove bolts-A-.
– Disconnect refrigerant lines -B- and -C-.
Note
♦
Seal open lines and the connections on the expansion valve
with suitable caps (to prevent dirt and moisture from entering).
♦
After switching off the A/C compressor in this vehicle, it may
take a relatively long time for the pressure on the high pressure
side to decrease. This is because the expansion valve is cold
and the pressure on the low pressure side increases quickly
after shutting the compressor off, then the expansion valve
closes and the refrigerant flows slowly to the low pressure
side.
♦
In model year 2007, the hose piece in the refrigerant line on
the high pressure side (thin line) -C- was discontinued as a
running change. Bend a refrigerant line -C- carefully, and only
as far as absolutely necessary to remove the expansion valve.
If necessary, loosen a refrigerant line that has no flexible piece
of tubing out of the bracket so that the refrigerant line does not
get damaged.
Installing
• Tightening specification: Bolts -A- (Refrigerant line expansion
valve mounting screws) - 10 Nm
Installation is carried out in the reverse order while noting the fol‐
lowing:
– Replace O-ring seals -D- and -E-, version, refer to Electronic
Parts Catalog (ETKA).
– Check fitted pin -G- (installed in connection or in expansion
valve, not installed at all connections) and sleeve -H- for dam‐
age and proper seating.
Note
♦
Coat the O-ring seals lightly with refrigerant oil prior to instal‐
lation. Refer to ⇒ “1.21 Refrigerant Circuit O-rings“, page 41 .
♦
Check the O-rings for proper seating within the groove -F- on
the refrigerant line.
♦
Install refrigerant pipes such that they are not strained.
♦
Depending on vehicle equipment and on engine, heat insula‐
tion has been applied to refrigerant lines, these must not be
damaged and must be re-applied after installing.
♦
Check installation position of refrigerant lines to expansion
valve (they must not contact other components) and position
and state of heat protection insulation applied to refrigerant
lines if necessary (not installed on all engine types).
– Discharge and fill the refrigerant circuit. Refer to ⇒ Refrigerant
R134a Servicing; Rep. Gr. 00 ; Description and Operation (A/
C Service Station).
– Install remaining components.
– Operate the A/C system after filling the refrigerant circuit. Re‐
fer to
⇒ “1.4 A/C System, Operating After Filling Refrigerant Circuit“,
page 28 .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
182 Rep. Gr.87 - Air Conditioning
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