ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
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.
– Unscrew refrigerant pressure and temperature sender 4 -
G828--4- while counterholding at refrigerant line using open-
end spanner.
Installing
Installation is carried out in reverse order; note the following:
– Install seals, making sure they are free of oil.
– Check that refrigerant lines are seated correctly and tight‐
en refrigerant pressure and temperature sender 4 -G828-;
counterhold using open-end spanner while doing so.
– Perform function “Opening electrically actuated valves in re‐
frigerant circuit for extracting, evacuating and charging” with
⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00; Starting diagnosis.
– ⇒ Air conditioners with refrigerant R744 - General informa‐
tion; Rep. gr. 87; Working with the air conditioner service
station; Charging refrigerant circuit
Tightening torques
♦ ⇒ Rep. gr. 87; Exploded view - refrigerant lines
3.21
Removing and installing refrigerant
pressure and temperature sender 5
[G829]
3.21.1
Removing and installing refrigerant
pressure and temperature sender 5
[G829]
Special tools and workshop equipment required
♦ engine bung set -VAS 6122-
Removing
Immediately seal any open lines and connections with clean
plugs from engine bung set -VAS 6122-.
– 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; Draining refrigerant circuit.
– Remove air conditioner compressor -VX81- ⇒ Rep. gr. 87;
Removing and installing air conditioner compressor [VX81].
3. Refrigerant circuit
43
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Mark (to avoid interchanging) and disconnect electrical con‐
nector -5-.
– Check connection of refrigerant line -1- and refrigerant pres‐
sure and temperature sender 5 -G829- -4- for soiling, and
clean as necessary.
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.
– Unscrew refrigerant pressure and temperature sender 5 -
G829- -4- while counterholding at refrigerant line with open-
end spanner.
Installing
Install in reverse order of removal, observing the following:
– Install seals free of oil.
– Make sure that refrigerant lines are seated correctly, and
tighten refrigerant pressure and temperature sender 5 -
G829- while counterholding with open-end spanner.
– 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
♦ ⇒ Rep. gr. 87; Assembly overview – drive unit of air condi‐
tioner compressor
44
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
3.22
Removing and installing pressure relief
valve, R744
3.22.1
Removing and installing pressure limit‐
ing valve
Special tools and workshop equipment required
♦ ESD workplace -VAS 6613-
Removing
– Remove heat pump valve unit ⇒ Rep. gr. 87; Removing and
installing heat pump valve unit.
NOTICE
Risk of damage to electrical components.
Electrostatic discharge can cause damage to electrical com‐
ponents.
– Work on electrical components must always be performed
on an ESD workplace.
– Place heat pump valve unit on ESD workplace -VAS 6613-.
Remove pressure limiting valve on valve block for refrigerant
expansion valve 2 -N637- and refrigerant expansion valve 3
-N638-:
– ⇒ Rep. gr. 87; Removing and installing refrigerant expansion
valve 2 N637
Remove pressure limiting valve on valve block for refrigerant
shut-off valve 4 -N642- and refrigerant shut-off valve 5 -N643-:
– ⇒ Rep. gr. 87; Removing and installing refrigerant shut-off
valve 4 N642
– Check area around pressure limiting valve -2- for dirt and
clean it.
– Unscrew pressure limiting valve -2- from valve block -1-.
Note
The pressure limiting valve has a left-hand thread.
Installing
Installation is carried out in reverse order; note the following:
3. Refrigerant circuit
45
2024 VW ID.4 Owner's Manual
