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5.18.10 Expansion Valve
Note
♦
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.
Removing
– Switch off ignition.
– Discharge refrigerant circuit. Refer to ⇒ Refrigerant R134a
Servicing; Rep. Gr. 00 ; Description and Operation (A/C Serv‐
ice Station).
– Disconnect refrigerant lines from expansion valve. Refer to
⇒ “5.18.13 Refrigerant Lines, Disconnecting and Connecting
From Expansion Valve“, page 180 .
– Remove bolts -A-.
– Pull expansion valve -B- out of heat protection insulation -C-.
Note
Seal all open lines and connections on evaporator with suitable
caps (avoid dirt and moisture from entering the system).
Installing
• Tightening specification: Bolts -A- (expansion valve to bracket
on evaporator) - 10 Nm
Installation is carried out in the reverse order while noting the fol‐
lowing:
– Replace O-rings -D- and -E-. Version, refer to Electronic Parts
Catalog.
– Make sure that O-rings -D- and -E- are properly seated on
connecting pipes to evaporator -F- and -G-.
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
174 Rep. Gr.87 - Air Conditioning
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