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
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
Pressure limiting valves with damaged protective film must not
be fitted.
– Before installing, check protective film -3- on pressure limit‐
ing valve -2- for damage.
– Install seals and retaining elements, making sure they are
free of oil.
Tightening torques
♦ ⇒ Rep. gr. 87; Exploded view - refrigerant lines
♦ ⇒ Rep. gr. 87; Exploded view - heat pump valve unit
3.23
Removing and installing heat exchang‐
er for high-voltage battery, R1234yf
3.23.1
Removing and installing heat exchang‐
er for high-voltage battery
Special tools and workshop equipment required
♦ engine bung set -VAS 6122-
♦ hose clamps up to 25 mm -3094-
Removing
Seal off open pipes/lines and connections immediately with
clean plugs from engine bung set -VAS 6122-.
– ⇒ Air conditioners with refrigerant R1234yf - General infor‐
mation; Rep. gr. 87; Working with the air conditioner service
station; Discharging refrigerant circuit.
– Remove air intake box of heater and air conditioning unit
⇒ Rep. gr. 87; Removing and installing air intake box of
heater and air conditioning unit.
CAUTION
The cooling system may be under pressure. Risk of scalding
due to hot steam and hot coolant
Danger of scalding skin and other parts of the body
– Put on protective gloves.
– Put on safety goggles.
– Cover filler cap on expansion tank with a suitable cloth and
open carefully to release pressure.
– Unfasten coolant expansion tank and move slightly to side
⇒ Rep. gr. 19; Cooling system/coolant; Removing and instal‐
ling coolant expansion tank.
46
Rep. gr.87 - Air conditioning system
2024 VW ID.4 Owner's Manual
