ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
After renewal of air conditioner compressor:
– Carry out function “Air conditioner compressor run-in” using
⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00; Access to diagno‐
ses.
Tightening torques
♦ ⇒ Rep. gr. 87; Assembly overview – air conditioner compres‐
sor
♦ ⇒ Rep. gr. 87; Assembly overview - refrigerant lines
5.5
Removing and installing air conditioner
compressor [VX81], R744
5.5.1
Removing and installing air conditioner
compressor [VX81]
Special tools and workshop equipment required
♦ engine bung set -VAS 6122-
Removing
Immediately seal any open lines and connections with clean
plugs from engine bung set -VAS 6122-.
– 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.
DANGER
High voltage can cause fatal injury.
Danger of severe or fatal injuries from electric shock or elec‐
tric 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.
– 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.
– Disconnect electrical connectors -3-, and unclip lines ⇒ Elec‐
tric drive motor; Rep. gr. 93; High-voltage cables; Discon‐
necting high-voltage connectors.
5. Air conditioner compressor
103
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Unclip cable retainer -4-.
– Unscrew bolts -2-.
– 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 re‐
frigerant 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 cre‐
ated pressure in the refrigerant circuit.
– Unscrew bolts -3-, and pull off refrigerant lines.
– Remove air conditioner compressor -VX81--1-.
Detaching air conditioner compressor from bracket (if necessa‐
ry):
– ⇒ Rep. gr. 87; Detaching/attaching air conditioning compres‐
sor from/to bracket.
Installing
Install in reverse order of removal, observing the following:
When renewing air conditioner compressor:
– Carry out adaption routine for refrigerant oil capacity, and
clean refrigerant circuit, if necessary ⇒ Air conditioning sys‐
tems with refrigerant R744 – General notes; Rep. gr. 87;
Refrigerant circuit; Renewing components.
– Install seals and captive fasteners free of oil.
– Check screw connections of potential equalisation line, and
clean them if necessary ⇒ Electrical system; Rep. gr. 97;
Cleaning contact surfaces; Cleaning contact surfaces.
104
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
Important
Contact surfaces must be free of dirt, rust and grease.
•
– Connect potential equalisation line, and tighten bolt -4-.
– 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; Charging refrigerant circuit.
WARNING
High voltage can cause fatal injury.
Danger of severe or fatal injuries from electric shock or elec‐
tric 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:
– After charging refrigerant circuit and re-energising high-volt‐
age system, carry out functions “Adapt air conditioning com‐
pressor” and “Compressor run-in” using ⇒ Vehicle diagnostic
tester ⇒ Rep. gr. 00; Access to diagnoses.
Tightening torques
♦ ⇒ Rep. gr. 87; Assembly overview – air conditioner compres‐
sor
♦ ⇒ Rep. gr. 87; Assembly overview – refrigerant lines
5.6
Detaching and attaching air conditioner
compressor at bracket
Removing
– Remove air conditioner compressor -VX81- ⇒ Rep. gr. 87;
Removing and installing air conditioner compressor VX81.
– Remove bolts -2-.
5. Air conditioner compressor
105
2024 VW ID.4 Owner's Manual
