ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– ⇒ Air conditioning systems with refrigerant R1234yf – Gener‐
al notes; 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 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.
Tightening torques
♦ ⇒ Rep. gr. 87; Assembly overview - refrigerant lines
♦ ⇒ Rep. gr. 87; Assembly overview – heater and air condition‐
ing unit
♦ ⇒ Rep. gr. 87; Assembly overview – evaporator housing
♦ ⇒ General body repairs, interior; Rep. gr. 70; Central tube for
dash panel; Assembly overview – central tube for dash panel
7.6
Removing and installing heater and air
conditioning unit, R744
7.6.1
Removing and installing heater and air
conditioning unit
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-.
If heater and air conditioning unit, evaporator or heat condenser
has been renewed:
– 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.
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.
– 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.
7. Front heater and air conditioning unit
137
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– 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.
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 -1- through -4-.
– Pull off refrigerant lines.
– Remove dash panel cross member ⇒ General body repairs,
interior; Rep. gr. 70; Dash panel cross member; Removing
and installing dash panel cross member.
– Remove rear footwell vent ⇒ Rep. gr. 87; Removing and
installing rear footwell vent.
– Detach air duct for rear centre console vent from heater and
air conditioning unit ⇒ Rep. gr. 87; Removing and installing
air duct for rear centre console vent.
– Disconnect electrical connectors and electrical wire from
heater and air conditioning unit.
NOTICE
Risk of damage to airbag control unit. Electrical connectors
corrode when exposed to moisture.
– After unplugging connectors for control unit, cover them or
seal them off to prevent moisture from entering.
– Cover area under condensation drain with waterproof foil
and absorbent paper.
138
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Pull condensation drain -2- off connection of heater and air
conditioning unit -1- -arrow A-.
– Disconnect electrical connector - 7-, and loosen retaining
clip -5-.
– Unscrew nut -8-, and detach potential equalisation line.
Important
•
The aid of an additional person is required for the subse‐
quent work steps.
– Remove heater and air conditioning unit -1-.
Installing
Install in reverse order of removal, observing the following:
7. Front heater and air conditioning unit
139
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
If components of refrigerant circuit have been renewed:
– Carry out adaption routine for refrigerant oil capacity in re‐
frigerant circuit ⇒ Air conditioning systems with refrigerant
R744 – General notes; Rep. gr. 87; Refrigerant circuit; Re‐
newing components.
– Check gasket between heater and air conditioning unit and
bulkhead for damage.
– Make sure that the condensation drain is properly seated
⇒ Rep. gr. 87; Removing and installing condensation drain.
– Check screw connections of potential equalisation line, and
clean them if necessary ⇒ Electrical system; Rep. gr. 97;
Cleaning contact surfaces; Cleaning contact surfaces.
Important
•
Contact surfaces must be free of dirt, rust and grease.
– Connect potential equalisation line, and tighten nut -8-.
– Connect electrical connectors.
– Install seals and captive fasteners free of oil.
– Install air intake box of heater and air conditioning unit
⇒ Rep. gr. 87; Removing and installing air intake unit of
heater and air conditioning unit.
– 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.
140
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
Tightening torques
♦ ⇒ Rep. gr. 87; Assembly overview - refrigerant lines
♦ ⇒ Rep. gr. 87; Assembly overview – heater and air condition‐
ing unit
♦ ⇒ Rep. gr. 87; Assembly overview – evaporator housing
♦ ⇒ General body repairs, interior; Rep. gr. 70; Central tube for
dash panel; Assembly overview – central tube for dash panel
7.7
Removing and installing evaporator,
R1234yf
7.7.1
Removing and installing evaporator
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-.
– ⇒ Air conditioning systems with refrigerant R1234yf – Gener‐
al notes; Rep. gr. 87; Working with air conditioner service
station; Draining refrigerant circuit.
– Remove heater and air conditioning unit ⇒ Rep. gr. 87; Re‐
moving and installing heater and air conditioning unit.
– Unscrew bolts -2-.
– Remove evaporator housing cover -1-.
– Pull evaporator -1- out of evaporator housing.
– Remove expansion valve -3- ⇒ Rep. gr. 87; Removing and
installing expansion valve.
7. Front heater and air conditioning unit
141
2024 VW ID.4 Owner's Manual
