Audi Q5 2008 - Refrigerant Circuit Flushing with Compressed Air and Nitrogen

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refrigerant oil still inside the removed A/C compressor
⇒ “5 Removal and Installation“, page 191 and fill with new
refrigerant oil. Refer to
⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
Note
♦ There is a defined and prescribed amount of refrigerant oil in
the replacement compressor. If the vehicle has two evapora‐
tors, then there refrigerant circuit requires a specific quantity
of refrigerant oil. Refer to ⇒ Heating, Ventilation and Air Con‐
ditioning; Rep. Gr. 87 ; Removal and Installation (vehicle-
specific repair manual) and
⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
♦ If the A/C compressor is not be replaced, the quantity of re‐
frigerant oil in the A/C compressor must be topped off to the
prescribed capacity (tilt the refrigerant oil out and refill the pre‐
scribed quantity into the A/C compressor or refrigerant circuit).
Refer to ⇒ “5 Removal and Installation“, page 191 and
⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
– Reassemble the refrigerant circuit completely. Refer to ⇒
Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ; Re‐
moval and Installation (vehicle-specific repair manual).
– Evacuate and recharge refrigerant circuit according to speci‐
fication. Refer to
⇒ “2.4.11 Evacuating Refrigerant Circuit“, page 89 and
⇒ “2.4.3 Charging Refrigerant Circuit“, page 83 .
– Start up A/C system according to specification. Refer to ⇒
Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ; Re‐
moval and Installation and
⇒ “2.4.1 A/C System, Operating after Charging“, page 79 .
1.4.12 Refrigerant Circuit Flushing With Com‐
pressed Air and Nitrogen
Compressed air and nitrogen are to be used in order to force out
moisture and other contaminants as well as old refrigerant oil as
efficiently as possible, without wasting refrigerant. Clean refrig‐
erant circuit (flush with refrigerant R134a or blow through with
compressed air and nitrogen).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
1. General Information 29