ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
Installing
Install in reverse order of removal, observing the following:
– Install seals and captive fasteners free of oil.
When renewing expansion valve/shut-off valve:
– Carry out function “Addressing routine for refrigerant valves”
using ⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00; Access to
diagnoses.
Tightening torques
♦ ⇒ Rep. gr. 87; Assembly overview – valve unit of heat pump
4.4
Removing and installing refrigerant ex‐
pansion valve 2 N637
Special tools and workshop equipment required
♦ ESD workplace -VAS 6613-
Removing
Refrigerant expansion valve 2 -N637- and refrigerant expansion
valve 3 -N638- cannot be renewed separately.
– 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 bolts -1-, -2- and -3-.
– Mark electrical connectors -2- to avoid interchange and un‐
plug them.
90
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Remove bolts -3-.
– Detach refrigerant expansion valve 2 -N637- and refrigerant
expansion valve 3 -N638- -1-.
Installing
Installation is carried out in reverse order; note the following:
– Install seals and retaining elements, making sure they are
free of oil.
If expansion valves have been renewed:
– Perform function “Addressing refrigerant valves” using ⇒ Ve‐
hicle diagnostic tester ⇒ Rep. gr. 00; Starting diagnosis.
Tightening torques
♦ ⇒ Rep. gr. 87; Exploded view - heat pump valve unit
4.5
Removing and installing refrigerant ex‐
pansion valve 3 N638
Removing and installing
Refrigerant expansion valve 3 -N638- is removed together with
refrigerant expansion valve 2 -N637- and cannot be renewed
separately ⇒ Rep. gr. 87; Removing and installing refrigerant
expansion valve 2 N637.
4.6
Removing and installing refrigerant
shut-off valve 1 N696
Removing and installing
Refrigerant shut-off valve 1 -N696- is removed together with
refrigerant expansion valve 1 -N636- and cannot be renewed
separately ⇒ Rep. gr. 87; Removing and installing refrigerant
expansion valve 1 N636.
4.7
Removing and installing refrigerant
shut-off valve 2 N640
Special tools and workshop equipment required
♦ ESD workplace -VAS 6613-
♦ counterhold tool -T10630-
Removing
Refrigerant shut-off valve 2 -N640- and refrigerant shut-off valve
3 -N641- cannot be renewed separately.
– Remove heat pump valve unit ⇒ Rep. gr. 87; Removing and
installing heat pump valve unit.
4. Valve unit of heat pump
91
2024 VW ID.4 Owner's Manual
