Audi A8 1994 - Page 77

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2.1.15 Refrigerant Pipe With Inner Heat Ex‐
changer
In this refrigerant pipe, the flowing fluid warm refrigerant on the
high pressure side is delivered into the low pressure side as flow‐
ing, vapor, cold refrigerant to increase the efficiency of the A/C
system.
Note
This illustration shows a refrigerant pipe with an inner heat ex‐
changer that is installed in the Audi A4 from MY 2008 and on the
Audi A5 Coupe from MY 2008. Refer to ⇒ Heating, Ventilation
and Air Conditioning; Rep. Gr. 87 ; Description and Operation
(vehicle-specific repair manual).
A - Refrigerant pipe with inner heat exchanger
B - Channel inside the refrigerant pipe through with the warm fluid
refrigerant flows to the evaporator (refrigerant circuit high pres‐
sure side)
C - Channel inside the refrigerant pipe in which the vapor of cold
refrigerant flow to the A/C compressor (refrigerant circuit low
pressure side)
2.1.16 Reservoir
The reservoir collects the vaporized and gaseous mixture coming
from the evaporator to ensure the compressor only receives gas‐
eous refrigerant. Gaseous refrigerant is formed from the vapor.
The refrigerant oil flowing in the circuit is not retained in the res‐
ervoir as it has an oil drilling.
Moisture which has entered the refrigerant circuit during repairs
will be collected by a filter (desiccant bag) in the reservoir.
Gaseous refrigerant is extracted with oil by the A/C compressor.
Note
♦ Replace the reservoir if refrigerant circuit has been open for a
long time (beyond the normal repair time) and moisture has
penetrated inside, or if required due to a specific complaint.
Refer to ⇒ “5 Removal and Installation“, page 191 .
♦ Remove sealing plugs -A- and -B- only immediately prior to
installing.
♦ A desiccant bag in an unsealed reservoir is saturated with
moisture after a short period of time and unusable.
♦ When installing, note arrow for direction of flow if necessary.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
2. Description and Operation 73