ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
4
Valve unit of heat pump
4.1
Exploded view - heat pump valve unit
Exploded view - heat pump valve unit, components
4. Valve unit of heat pump
81
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
1 - Guide sleeves
2 - Rubber bush
3 - Bolt
❑ Applies for all un‐
marked bolts in illustra‐
tion
❑ 8 Nm
4 - Bracket
5 - Bolt
❑ 3x
❑ 20 Nm
6 - Refrigerant expansion
valve 1 -N636-
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing refrig‐
erant expansion valve 1
N636
7 - Refrigerant shut-off valve
1 -N696-
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing refrig‐
erant shut-off valve 1
N696
8 - Refrigerant expansion
valve 3 -N638-
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing refrig‐
erant expansion valve 3
N638
9 - Refrigerant expansion
valve 2 -N637-
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing refrig‐
erant expansion valve 2 N637
10 - Electrical wiring for refrigerant pressure and temperature sender 4 -G828-
11 - Refrigerant shut-off valve 5 -N643-
❑ ⇒ Rep. gr. 87; Removing and installing refrigerant shut-off valve 5 N643
12 - Refrigerant shut-off valve 4 -N642-
❑ ⇒ Rep. gr. 87; Removing and installing refrigerant shut-off valve 4 N642
13 - Electrical wiring for heat pump valve unit
14 - Refrigerant shut-off valve 2 -N640-
❑ ⇒ Rep. gr. 87; Removing and installing refrigerant shut-off valve 2 N640
15 - Refrigerant shut-off valve 3 -N641-
❑ ⇒ Rep. gr. 87; Removing and installing refrigerant shut-off valve 3 N641
16 - Electrical wiring for refrigerant pressure and temperature sender 2 -G826-
17 - Electrical wiring for refrigerant pressure and temperature sender 5 -G829-
18 - High-voltage battery heat exchanger
❑ ⇒ Rep. gr. 87; Removing and installing heat exchanger for high-voltage battery
19 - Dryer
❑ ⇒ Rep. gr. 87; Removing and installing dryer
82
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
20 - Bracket
21 - Flexible joint
❑ 3 Nm
22 - Nut
❑ 15 Nm
Exploded view - refrigerant lines inside heat pump valve unit
1 - Refrigerant line
2 - Bolt
❑ Applies for all connec‐
tions in illustration
❑ Renew after removing
❑ 13 Nm
3 - Seal
❑ Applies for all connec‐
tions in illustration
❑ Renew after removing
4 - Retaining element
❑ Applies for all connec‐
tions in illustration
❑ Renew after removing
5 - Refrigerant line
6 - Dryer
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing dryer
7 - Refrigerant line
8 - Refrigerant line
9 - Refrigerant line
10 - Heat pump valve unit
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing heat
pump valve unit
11 - High-voltage battery heat
exchanger
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing heat
exchanger for high-volt‐
age battery
12 - Refrigerant line
Exploded view - refrigerant lines at heat pump valve unit
4. Valve unit of heat pump
83
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
1 - Refrigerant line
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing re‐
frigerant line between
expansion valve N636/
N696 and heat con‐
denser
2 - Refrigerant line
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing re‐
frigerant line between
expansion valve N638/
N637 and evaporator
3 - Refrigerant line
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing re‐
frigerant line between
condenser/gas cooler
and refrigerant shut-off
valve 2 N640
4 - High-voltage battery heat
exchanger
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing heat
exchanger for high-volt‐
age battery
5 - Refrigerant line
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing refrig‐
erant line between re‐
frigerant shut-off valve
3 N641 and heat con‐
denser
6 - Refrigerant line
❑ ⇒ Rep. gr. 87; Remov‐
ing and installing refrig‐
erant line between air conditioner compressor VX81 and valve block N641/N640
7 - Retaining element
❑ Applies for all connections in illustration
❑ Renew after removing
8 - Seal
❑ Applies for all connections in illustration
❑ Renew after removing
9 - Bolt
❑ Applies for all connections in illustration
❑ Renew after removing
❑ 13 Nm
10 - Heat pump valve unit
❑ ⇒ Rep. gr. 87; Removing and installing heat pump valve unit
11 - Refrigerant line
❑ ⇒ Rep. gr. 87; Removing and installing refrigerant line between heat pump valve unit and evaporator
84
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
4.2
Removing and installing valve unit of
heat pump
Special tools and workshop equipment required
♦ ESD workplace -VAS 6613-
♦ engine bung set -VAS 6122-
Removing
Immediately seal any open lines and connections with clean
plugs from engine bung set -VAS 6122-.
When renewing several components of heat pump valve unit at
the same time:
– Observe procedure for renewal of refrigerant circuit compo‐
nents ⇒ Air conditioning system with refrigerant R744 – Gen‐
eral notes; Rep. gr. 87; Refrigerant circuit; Renewing compo‐
nents.
– 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.
– ⇒ Rep. gr. 19; Cooling system/coolant; Draining coolant.
– Remove air intake unit of heater and air conditioning unit
⇒ Rep. gr. 87; Removing and installing air intake unit of
heater and air conditioning unit.
– Detach coolant expansion tank, and lay it slightly aside
⇒ Rep. gr. 19; Cooling system/coolant; Removing and instal‐
ling coolant expansion tank.
– Remove front underbody cladding ⇒ General body repairs,
exterior; Rep. gr. 66; Underbody cladding; Removing and
installing front underbody cladding.
– Separate coolant hose -1- and lay to one side.
4. Valve unit of heat pump
85
2024 VW ID.4 Owner's Manual
