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
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
♦ 1. Air conditioner service station
♦ 2. Refrigerant hose of air conditioner service station (low
pressure side)
♦ 3. Flushing device
♦ 4. Refrigerant hose
♦ 5. Adapter -VAS 6338/3-
♦ 6. Vehicle refrigerant line with connection to air conditioner
compressor (high-pressure side)
♦ 7. Vehicle refrigerant line with connection to air conditioner
compressor (low-pressure side)
♦ 8. Adapter -VAS 6338/12-
♦ 9. Refrigerant hose of air conditioner service station (high-
pressure side)
– 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.
3. Refrigerant circuit
79
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Check pressure in flushing circuit; only detach refrigerant
hoses and adapters if pressure is below or equal to ambient
pressure.
– Renew desiccant bag ⇒ Rep. gr. 87; Removing and instal‐
ling desiccant bag.
– Remove rinsing adapters and assemble refrigerant circuit.
– After charging refrigerant circuit and re-energising high-volt‐
age system, perform “Compressor activation” with ⇒ Vehicle
diagnostic tester ⇒ Rep. gr. 00; Starting diagnosis.
Tightening torques
♦ ⇒ Rep. gr. 87; Exploded view - refrigerant lines
♦ ⇒ Rep. gr. 87; Exploded view - evaporator housing
80
Rep. gr.87 - Air conditioning system
2024 VW ID.4 Owner's Manual
