Volkswagen ID.4: Valve unit of heat pump, R744

• Assembly overview - heat pump valve unit
• Removing and installing heat pump valve unit
• Removing and installing refrigerant expansion valve 1 N636
• Removing and installing refrigerant expansion valve 2 N637
• Removing and installing refrigerant shut-off valve 2 [N640]
• Removing and installing refrigerant shut-off valve 4 [N642]

Assembly overview - heat pump valve unit

1. Guide sleeve

• 3x

2. Rubber bush

• 3x

3. Bolt

• 11x
• 8 Nm

4. Bracket
5. Bolt

• 3x
• 20 Nm

6. Refrigerant expansion valve 1 - N636-

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant expansion valve 1 N636

7. Refrigerant shut-off valve 1 - N696-

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant shut-off valve 1 N696

8. Refrigerant expansion valve 3 - N638-

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant expansion valve 3 N638

9. Refrigerant expansion valve 2 - N637-

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant 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

20. Retainer
21. Flexible joint

• 3 Nm

22. Nut

• 15 Nm

Assembly overview - refrigerant lines inside heat pump valve unit

1. Refrigerant line
2. Bolt

• Applies to all connections in illustration
• Renew after removing
• Hexagon bolt: 13 Nm
• Twelve-point bolt: 5 Nm +90º

3. Seal

• Applies to all connections in illustration
• Renew after removing

4. Retaining element

• Applies to all connections in illustration
• Renew after removing

5. Refrigerant line
6. Dryer

• ⇒ Rep. gr. 87 ; Removing and installing dryer

7. Refrigerant line
8. Refrigerant line
9.  Refrigerant line
10.  Heat pump valve unit

• ⇒ Rep. gr. 87 ; Removing and installing heat pump valve unit

11. High-voltage battery heat exchanger

• ⇒ Rep. gr. 87 ; Removing and installing heat exchanger for high-voltage battery

12. Refrigerant line

Assembly overview - refrigerant lines at heat pump valve unit

1. Refrigerant line

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant line between expansion valve N636/ N696 and heat condenser

2. Refrigerant line

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant line between expansion valve N638/ N637 and evaporator

3. Refrigerant line

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant line between condenser/gas cooler and refrigerant shut-off valve 2 N640

4.  High-voltage battery heat exchanger

• ⇒ Rep. gr. 87 ; Removing and installing heat exchanger for high-voltage battery

5. Refrigerant line

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant line between refrigerant shutoff valve 3 N641 and heat condenser

6. Refrigerant line

• ⇒ Rep. gr. 87 ; Removing and installing refrigerant line between air conditioner compressor VX81 and valve block N641/N640

7. Retaining element

• Applies to all connections in illustration
• Renew after removing

8. Seal

• Applies to all connections in illustration
• Renew after removing

9.  Bolt

• Applies to all connections in illustration
• Renew after removing
• 5 Nm +90º

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

Removing and installing heat pump valve unit

Special tools and workshop equipment required

• ESD workplace - VAS 6613-
• engine bung set - VAS 6122-

Removing

Immediately seal 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 renewing components in refrigerant circuit ⇒ General information - air conditioning systems with refrigerant R744; Rep. gr. 87 ; Renewing components .

Continued

• 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 station; Draining refrigerant circuit .
• Remove lock carrier ⇒ General body repairs, exterior; Rep.

  gr. 50 ; Lock carrier; Removing and installing lock carrier .

• ⇒ Rep. gr. 19 ; Cooling system/coolant; Draining coolant .
• Remove air intake box 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 aside ⇒ Rep.

  gr. 19 ; Cooling system/coolant; Removing and installing 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.

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 refrigerant 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 created pressure in the refrigerant circuit.

• Unscrew bolt -2-.
• Pull off refrigerant line -3-.

Right-hand drive vehicles:

• Remove lock carrier bar ⇒ General body repairs, exterior; Rep. gr. 50 ; Lock carrier; Removing and installing lock carrier bar .
• Remove air conditioner compressor ⇒ Rep. gr. 87 ; Removing and installing air conditioner compressor .

All vehicles (continued)

Left-hand drive vehicles:

• Mark (to avoid interchanging) and disconnect electrical connector -3-.
• Unscrew bolt -2-.
• Pull off refrigerant line -1-.

All vehicles (continued)

• Unscrew bolts -3-.
• Pull off refrigerant line -1- and -2-, and collect escaping oil.

Important

• Amount of refrigerating oil that has escaped must be taken into account when filling refrigerant circuit.

• Loosen clamps -3-.
• Pull off coolant hoses -1- and -2-.

• Mark (to avoid interchanging) and disconnect electrical connectors -1- and -2-.

• Unscrew bolts -1- through -4-.
• Pull off refrigerant lines.

• Unscrew bolts -2- through -4- from bracket of heat pump valve unit -1-.

• Remove valve unit of heat pump -1- upwards.

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.
• Place heat pump valve unit onto ESD workplace - VAS 6613- .

Installing

Install in reverse order of removal, observing the following:

• Install seals and captive fasteners free of oil.

After renewal of several components of heat pump valve unit at the same time:

• Carry out adaption routine for refrigerant oil capacity in refrigerant circuit ⇒ General information - air conditioning systems with refrigerant R744; Rep. gr. 87 ; Renewing components .

Continued

• 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 station; Charging refrigerant circuit .
• ⇒ Rep. gr. 19 ; Cooling system/coolant; Filling cooling system

Tightening torques

• ⇒ Rep. gr. 87 ; Assembly overview - heat pump valve unit
• ⇒ Rep. gr. 87 ; Assembly overview - refrigerant lines
• ⇒ Rep. gr. 87 ; Assembly overview - air intake box of heater and air conditioning unit

Removing and installing refrigerant expansion valve 1 N636

Special tools and workshop equipment required

• ESD workplace - VAS 6613-

Available versions

Variante A - up to approx. 10/2023, identifiable by pressure sender aligned horizontally in refrigerant line -1-

Variante B - as of approx. 11/2023, identifiable by pressure sender aligned vertically -2-

Removing and installing, version A

Removing

Refrigerant expansion valve 1 - N636- and refrigerant shut-off valve 1 - N696- cannot be renewed individually.

• Remove heat pump valve unit ⇒ Rep. gr. 87 ; Removing and installing heat pump valve unit .

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.

• Place heat pump valve unit onto ESD workplace - VAS 6613- .

• Unscrew bolts -1-, -2- and -3-.

• Mark (to avoid interchanging) and disconnect electrical connectors -2-.
• Unscrew bolts -3-.
• Remove refrigerant expansion valve 1 - N636- and refrigerant shut-off valve 1 - N696- -1-.

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 - heat pump valve unit

Removing and installing, version B

Removing

Refrigerant expansion valve 1 - N636- and refrigerant shut-off valve 1 - N696- cannot be renewed individually.

• Remove heat pump valve unit ⇒ Rep. gr. 87 ; Removing and installing heat pump valve unit .

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.

• Place heat pump valve unit onto ESD workplace - VAS 6613- .

• Unscrew bolts -1-, -2- and -3-.

• Mark (to avoid interchanging) and disconnect electrical connectors -2-.
• Unscrew bolts -3-.
• Remove refrigerant expansion valve 1 - N636- and refrigerant shut-off valve 1 - N696- -1-.

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 - heat pump valve unit

Removing and installing refrigerant expansion 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 charge may damage electrical components.

• Work on electrical components must always be carried out at 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 unplug them.
• 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 ⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00 ; Starting diagnosis .

Continued

Tightening torques

• ⇒ Rep. gr. 87 ; Exploded view - heat pump valve unit

Removing and installing refrigerant expansion 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 .

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 .

Removing and installing refrigerant shut-off valve 2 [N640]

Special tools and workshop equipment required

• ESD workplace - VAS 6613-
• counterhold tool - T10630-

Available versions

Variante A - up to approx. 10/2023, identifiable by pressure sender aligned horizontally in refrigerant line -1-

Variante B - as of approx. 11/2023, identifiable by pressure sender aligned vertically -2-

Removing and installing, version A

Removing

Refrigerant shut-off valve 2 - N640- and refrigerant shut-off valve 3 - N641- cannot be renewed individually.

• Remove heat pump valve unit ⇒ Rep. gr. 87 ; Removing and installing heat pump valve unit .

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.
• Place heat pump valve unit onto ESD workplace - VAS 6613- .

• Insert counterhold tool - T10630- -4-.
• Unscrew bolts -1-, -2-, -3- and -5-.
• Pull off refrigerant lines

• Mark (to avoid interchanging) and disconnect electrical connectors -2-.
• Unscrew bolts -3-.
• Remove refrigerant shut-off valve 2 - N640- and refrigerant shut-off valve 3 - N641- -1-.

Installing

Install in reverse order of removal, observing the following:

• Install seals and captive fasteners free of oil.
• When tightening bolts -3-, use counterhold tool - T10630- .

If shut-off valve have been renewed:

• 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 - heat pump valve unit

Removing and installing, version B

Removing

Refrigerant shut-off valve 2 - N640- and refrigerant shut-off valve 3 - N641- cannot be renewed individually.

• Remove heat pump valve unit ⇒ Rep. gr. 87 ; Removing and installing heat pump valve unit .

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.

• Place heat pump valve unit onto ESD workplace - VAS 6613- .

• Unscrew bolts -1-, -2-, -3- and -4-.
• Remove refrigerant lines.

• Mark (to avoid interchanging) and disconnect electrical connectors -2-.
• Unscrew bolts -3-.
• Remove refrigerant shut-off valve 2 - N640- and refrigerant shut-off valve 3 - N641- -1-.

Installing

• Install seals and captive fasteners free of oil.

If shut-off valve have been renewed:

• 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 - heat pump valve unit

Removing and installing refrigerant shut-off valve 3 N641

Removing and installing

Refrigerant shut-off valve 3 - N641- is removed together with refrigerant shut-off valve 2 - N640- and cannot be renewed separately ⇒ Rep. gr. 87 ; Removing and installing refrigerant shut-off valve 2 N640 .

Removing and installing refrigerant shut-off valve 4 [N642]

Special tools and workshop equipment required

• ESD workplace - VAS 6613-

Available versions

Variante A - up to approx. 10/2023, identifiable by pressure sender aligned horizontally in refrigerant line -1-

Variante B - as of approx. 11/2023, identifiable by pressure sender aligned vertically -2

Removing and installing, version A

Removing

Refrigerant shut-off valve 4 - N642- and refrigerant shut-off valve 5 - N643- cannot be renewed individually.

• Remove heat pump valve unit ⇒ Rep. gr. 87 ; Removing and installing heat pump valve unit .

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.

• Place heat pump valve unit onto ESD workplace - VAS 6613- .

• Unscrew bolts -2-, -3- and -4-.
• Pull off refrigerant line -1-.

• Unscrew bolts -1- and -2-.

• Mark (to avoid interchanging) and disconnect electrical connectors -2-.
• Unscrew bolts -3-.
• Remove refrigerant shut-off valve 4 - N642- and refrigerant shut-off valve 5 - N643- -1-.

Installing

Install in reverse order of removal, observing the following:

• Install seals and captive fasteners free of oil.

If shut-off valve have been renewed:

• 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 - heat pump valve unit

Removing and installing, version B

Removing

Refrigerant shut-off valve 4 - N642- and refrigerant shut-off valve 5 - N643- -1- cannot be renewed individually.

• Remove heat pump valve unit ⇒ Rep. gr. 87 ; Removing and installing heat pump valve unit .

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.

• Place heat pump valve unit onto ESD workplace - VAS 6613- .

• Unscrew bolts -2-, -3- and -4-.
• Pull off refrigerant line -1-.

• Unscrew bolts -1- and -2-.

• Mark (to avoid interchanging) and disconnect electrical connectors -2-.
• Unscrew bolts -3-.
• Remove refrigerant shut-off valve 4 - N642- and refrigerant shut-off valve 5 - N643- -1-.

Installing

Install in reverse order of removal, observing the following:

• Install seals and captive fasteners free of oil.

If shut-off valve have been renewed:

• 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 - heat pump valve unit

Removing and installing refrigerant shut-off valve 5 N643

Removing and installing

Refrigerant shut-off valve 5 - N643- is removed together with refrigerant shut-off valve 4 - N642- and cannot be renewed separately ⇒ Rep. gr. 87 ; Removing and installing refrigerant shut-off valve 4 N642 .