Volkswagen ID.4: Air conditioner compressor, R134a/R1234yf

• Assembly overview - air conditioner compressor
• Detaching and attaching refrigerant lines at air conditioner compressor
• Detaching/attaching air conditioner compressor [VX81] from/to bracket

Assembly overview - air conditioner compressor

1. Air conditioner compressor - VX81-

• ⇒ Rep. gr. 87 ; Removing and installing air conditioner compressor [VX81]

2. Electrical connector for high-voltage system

• ⇒ Electric drive motor; Rep. gr. 93 ; High-voltage cables; Overview of fitting locations - high-voltage cables

3. Electrical connector
4. Bolt

•  8 Nm

5. Potential equalisation line

• ⇒ Electric drive motor; Rep. gr. 93 ; Potential equalisation lines; Overview of fitting locations - potential equalisation lines

6. Bolt

• Qty. 3
• 20 Nm

7. Retainer

• ⇒ Rep. gr. 87 ; Detaching and attaching air conditioner compressor at bracket

8. Bolt

• Qty. 4
• 8 Nm

9. Bolt

• Qty. 3
• 20 Nm
• Retainer
• ⇒ Rep. gr. 87 ; Detaching and attaching air conditioner compressor at bracket

Detaching and attaching refrigerant lines at air conditioner compressor

Special tools and workshop equipment required

• engine bung set - VAS 6122-

Detaching

Seal open lines and connections immediately with clean plugs from engine bung set - VAS 6122- .

• ⇒ General information - Air conditioners with refrigerant R134a/R1234yf; 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

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.

• Remove bolts -3- and detach refrigerant lines -2-.

Attaching

Installation is carried out in reverse order; note the following:

• ⇒ General information - Air conditioners with refrigerant R134a/R1234yf; Rep. gr. 87 ; Working with the air conditioner service station; Charging refrigerant circuit .

Tightening torques

• ⇒ Rep. gr. 87 ; Assembly overview - refrigerant lines

Removing and installing air conditioner compressor [VX81]

Special tools and workshop equipment required

• engine bung set - VAS 6122-

Removing

Immediately seal open lines and connections with clean plugs from engine bung set - VAS 6122- .

DANGER

High voltage can cause fatal injury.

Danger of severe or fatal injuries from electric shock or electric arcs.

• Have a high-voltage technician (HVT) or a high-voltage expert (HVE) de-energise the high-voltage system.

• ⇒ Rep. gr. 93 ; De-energise high-voltage system .
• ⇒ General information, air conditioning systems with refrigerant R134a/R1234yf; Rep. gr. 87 ; Working with air conditioner service station; Draining refrigerant circuit .
• 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 .
• Disconnect electrical connectors -2-, and unclip electrical wires ⇒ Electric drive motor; Rep. gr. 93 ; High-voltage cables; Disconnecting high-voltage connectors .
• Unscrew bolts -3-.

• Unscrew bolt -4-.

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 bolts -3-, and pull off refrigerant lines.
• Remove air conditioner compressor - VX81- -1-.

If air conditioner compressor needs to be disconnected from bracket:

• ⇒ Rep. gr. 87 ; Detaching/attaching air conditioner compressor from/to bracket .

Installing

Install in reverse order of removal, observing the following:

When renewing air conditioner compressor:

Important

• The air conditioner compressor must not be flushed individually.

NOTICE

Risk of damage to components due to soiling.

• Keep the measuring beaker clean.

• Drain oil from removed air conditioner compressor into a measuring beaker -1- via the two connections to determine the amount of oil. Move the air conditioner compressor in a circular motion to ensure the best possible drainage.
• Check drained refrigerant oil for contamination.

Important

• Dark grey to black clouding indicates contamination.

Non-contaminated refrigeration oil:

• After removing protective caps on suction and pressure sides, drain oil from new air conditioner compressor into measuring beaker -2-. Move the air conditioner compressor in a circular motion to ensure the best possible drainage.
• The (drained) new air conditioner compressor must be filled with exact the same amount of refrigerant oil that has been determined in the removed air conditioner compressor (measuring beaker -2-). This is done via the suction pipe.

Continued

Contaminated refrigerant oil:

• ⇒ Rep. gr. 87 ; Clean refrigerant circuit .

Note

The new air conditioner compressor contains the amount of refrigeration oil required for the refrigerant circuit.

Continued

• Fit refrigerant lines -2-, and tighten bolts -3-.
• Check contact points of potential equalisation line, and clean them if necessary ⇒ Electrical system; Rep. gr. 97 ; Cleaning contact surfaces .

Important

• Contact surfaces must be free of dirt, rust and grease.

• Connect potential equalisation line, and tighten bolt -4-.

• ⇒ General information, air conditioning systems with refrigerant R134a/R1234yf; Rep. gr. 87 ; Working with air conditioner service station; Charging refrigerant circuit .

WARNING

High voltage can cause fatal injury.

Danger of severe or fatal injuries from electric shock or electric arcs.

• Have a high-voltage technician (HVT) or a high-voltage expert (HVE) re-energise the high-voltage system.

• ⇒ Rep. gr. 93 ; Re-energising high-voltage system

After renewal of air conditioner compressor:

• Carry out function "Air conditioner compressor run-in" using ⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00 ; Access to diagnoses .

Continued

Tightening torques

• ⇒ Rep. gr. 87 ; Assembly overview - air conditioner compressor
• ⇒ Rep. gr. 87 ; Assembly overview - refrigerant lines

Detaching/attaching air conditioner compressor [VX81] from/to bracket

Removing

• Remove air conditioner compressor - VX81- ⇒ Rep. gr. 87 ; Removing and installing air conditioner compressor [VX81] .
• Unscrew bolts -2-.
• Detach air conditioner compressor -3- from bracket -1-.

Installing

Install in the reverse sequence of removal, observing the following:

Tightening torques

• ⇒ Rep. gr. 87 ; Assembly overview - air conditioner compressor