ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Unscrew bolt -1-.
– Pull off refrigerant line -2-.
Connecting
Install in reverse order of removal, observing the following:
– Install seals and captive fasteners free of oil.
– Carry out function “Open electrically actuated valves to
drain, evacuate or charge refrigerant circuit” using ⇒ Vehicle
diagnostic tester ⇒ Rep. gr. 00; Access to diagnoses.
– ⇒ Air conditioning systems with refrigerant R744 – General
notes; Rep. gr. 87; Working with air conditioner service sta‐
tion; Charging refrigerant circuit.
Tightening torques
♦ ⇒ Rep. gr. 87; Assembly overview – refrigerant lines
♦ ⇒ General body repairs, exterior; Rep. gr. 50; Lock carrier;
Removing and installing lock carrier
♦ ⇒ General body repairs, exterior; Rep. gr. 66; Underbody
cladding; Assembly overview – underbody cladding
3.31
Cleaning refrigerant circuit, refriger‐
ant R744
3.31.1
Cleaning refrigerant circuit
Special tools and workshop equipment required
♦ Air conditioner service station
♦ air conditioner service station
♦ engine bung set -VAS 6122-
♦ flushing adapter -VAS 6338/77-
♦ flushing device
♦ The refrigerant circuit is flushed using refrigerant R1234yf
or R134a and the air conditioner service station which is
designed for this purpose.
♦ The following procedure is described for an air conditioner
service station with integrated flushing device for R1234yf
as an example. The procedure for an air conditioner service
station with integrated flushing device for R134a is similar.
♦ If the refrigerant circuit is contaminated, it is flushed in the
same direction as the normal direction of flow.
3. Refrigerant circuit
75
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
♦ There must be at least 6 kg of refrigerant in the air condition‐
er service station.
♦ Observe operating instructions for air conditioner service
station ⇒ Operating instructions.
Procedure
Important
•
Seal off open pipes/lines and connections immediately with
clean plugs from engine bung set -VAS 6122-.
– Detach refrigerant lines from air conditioner compressor
⇒ Rep. gr. 87; Detaching and attaching refrigerant lines at
air conditioner compressor.
– Unplug electrical connector -1- on refrigerant pressure and
temperature sender -G395- -2-.
– Connect low-pressure hose -1- of air conditioner service sta‐
tion to flushing device -3- of air conditioner service station
with quick-release coupling -2-.
– Screw refrigerant line (high-pressure side) -4- to flushing
adapter -VAS 6338/77- -3-.
76
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Screw refrigerant line (low-pressure side) -5- to flushing
adapter -VAS 6338/78- -6-.
– Screw refrigerant hose -7- of flushing device to flushing
adapter -VAS 6338/78- -6-.
– Connect refrigerant hose -2- of air conditioner service station
to flushing adapter -VAS 6338/77- -3-.
– Perform function “Opening electrically actuated valves in
refrigerant circuit for extracting, evacuating, charging and
flushing” with ⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00;
Starting diagnosis.
– Start flushing procedure via menu of air conditioner service
station ⇒ Operating instructions.
Important
•
Air conditioner service station displays when flushing proce‐
dure has been completed.
CAUTION
Risk of frostbite from escaping pressurised refrigerant
Risk of frostbite on skin and other parts of the body
– Put on protective gloves.
– Put on safety goggles.
– Extract/drain refrigerant and then immediately open up re‐
frigerant circuit.
– Extract/drain refrigerant again if more than 10 minutes
have passed since initial extraction and refrigerant circuit
has not been opened up. Renewed evaporation has cre‐
ated pressure in the refrigerant circuit.
– Check pressure in flushing circuit; only detach refrigerant
hoses and adapters if pressure is below or equal to ambient
pressure.
– Disconnect air conditioner service station and detach adapt‐
er.
– After charging refrigerant circuit and re-energising high-volt‐
age system, perform “Compressor activation” with ⇒ Vehicle
diagnostic tester ⇒ Rep. gr. 00; Starting diagnosis.
3. Refrigerant circuit
77
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
Tightening torques
♦ ⇒ Rep. gr. 87; Exploded view - refrigerant lines
3.32
Cleaning refrigerant circuit, refriger‐
ant R1234yf
3.32.1
Cleaning refrigerant circuit
Special tools and workshop equipment required
♦ Adapter -VAS 6338/3-
♦ Air conditioner service station
♦ MQB adapter -VAS 6338/38-
♦ adapter -VAS 6338/12-
♦ air conditioner service station
♦ engine bung set -VAS 6122-
♦ The following procedure is described for an air conditioner
service station with integrated flushing device for R1234yf as
an example.
♦ If the refrigerant circuit is contaminated, it is flushed against
the normal direction of flow.
♦ There must be at least 6 kg of refrigerant in the air condition‐
er service station.
♦ Observe operating instructions for air conditioner service
station ⇒ Operating instructions.
Procedure
Important
•
Seal off open pipes/lines and connections immediately with
clean plugs from engine bung set -VAS 6122-.
– Remove air conditioner compressor ⇒ Rep. gr. 87; Remov‐
ing and installing air conditioner compressor VX81.
– Fit adapter -VAS 6338/12- and adapter -VAS 6338/3- on
refrigerant lines.
– Remove expansion valve and fit MQB adapter -VAS
6338/38- in its place ⇒ Rep. gr. 87; Removing and installing
expansion valve.
– Remove desiccant bag and re-seal receiver ⇒ Rep. gr. 87;
Removing and installing desiccant bag.
– Screw caps with seals onto both service connections of re‐
frigerant circuit.
Note
The refrigerant circuit cannot be evacuated properly if caps are
not fitted, as air will enter when the vacuum in the refrigerant
circuit causes the valves in the service connections to open.
– Connect air conditioner service station -1- to refrigerant cir‐
cuit for flushing.
78
Rep. gr.87 - Air conditioning system
2024 VW ID.4 Owner's Manual
