Audi Q5 2008 - Page 40

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Note
♦ Components are always flushed in the opposite direction of
refrigerant flow when A/C system is in operation. Refer to
⇒ “2.1.9 Flushing Circuit Block Diagrams“, page 63 .
♦ While flushing, contaminants from the refrigerant circuit enter
the refrigerant circuit flushing device and the A/C service sta‐
tion and are absorbed by the filters and dryers installed there.
Depending on the contaminant, these components are to be
replaced in shorter intervals in line with operating instructions
for A/C service station or refrigerant circuit flushing device.
♦ The filter in the refrigerant circuit flushing device depends on
the type and degree of contamination in the flushed refrigerant
circuit, it should be changed after 5 to 10 flushing cycles (flush‐
ed vehicles) at the latest. If a heavily contaminated refrigerant
circuit is flushed (the refrigerant oil from the circuit is black and
viscous or there are many shavings in the refrigerant circuit),
the filter should be replaced after flushing. With a refrigerant
circuit heavily contaminated in this way, it is wise to flush the
circuit again after changing the filter.
♦ Depending on the type of contamination, dirt (old refrigerant
oil and abraded material from A/C compressor) is deposited
on the viewing glass. Clean this viewing glass if necessary
after flushing and flush the refrigerant circuit once more with
a flushing operation as a test (one completed cycle is suffi‐
cient).
♦ Liquid refrigerant cannot be led through the expansion valve,
restrictor and dryer bag of certain fluid reservoirs at an appro‐
priate speed, therefore these components must be removed
and replaced by adapters if necessary. Refer to ⇒ Heating,
Ventilation and Air Conditioning; Rep. Gr. 87 ; Removal and
Installation (vehicle-specific repair manual).
♦ Adapters for connecting A/C service station and for bridging
certain components of refrigerant circuit, refer to
⇒ “2.1.2 Adapter for Assembling Flushing Circuit“,
page 42 .
– Switch on A/C service station and flush refrigerant circuit (du‐
ration approximately 1 to 1.5 hours for one flushing cycle with
three flushing operations).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
36 Rep. Gr.00 - General, Technical Data