Audi A4 2001 - Auto-Check System and Fuel Gauge Sensors

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– After the flushing procedure has ended, check the viewing
glass(es) of refrigerant circuit flushing device, if they are
soiled, clean them if necessary according to operating instruc‐
tions of the refrigerant circuit flushing device or of the A/C
service station and perform the flushing procedure once more
as a test (one cycle is sufficient, duration approximately 30
min.)
– Check pressure in refrigerant circuit, there must be no positive
pressure in the refrigerant circuit (evacuate briefly once more
if necessary).
– Disconnect connections to A/C service station from vehicle
refrigerant circuit (there must be no positive pressure in the
refrigerant circuit).
– Replace these components depending on equipment (restric‐
tor and reservoir, expansion valve and fluid reservoir or dryer
cartridge inside the reservoir). Refer to ⇒ Heating, Ventilation
and Air Conditioning; Rep. Gr. 87 ; Removal and Installation
(vehicle-specific repair manual) and Electronic Parts Catalog
(ETKA).
– Replace the A/C compressor, depending on its condition, refer
to ⇒ Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ;
Removal and Installation (vehicle-specific repair manual) and
Electronic Parts Catalog (ETKA) or drain the rest of the refrig‐
erant oil still inside the removed A/C compressor, refer to
⇒ “5 Removal and Installation“, page 191 and fill new refrig‐
erant 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 .
♦ Flushing Circuit Block Diagrams, refer to
⇒ “2.1.9 Flushing Circuit Block Diagrams“, page 63 .
♦ Adapter for Assembling Flushing Circuit, refer to
⇒ “2.1.2 Adapter for Assembling Flushing Circuit“,
page 42 .
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