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
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
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 bolt -2-.
– Pull off refrigerant line -3-.
– Mark (to avoid interchanging) and disconnect electrical con‐
nector -3-.
– Unscrew bolt -2-.
– Pull off refrigerant line -1-.
– Unscrew bolts -3-.
– Pull off refrigerant line -1- and -2-.
– Loosen clamps -3-.
86
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– Pull off coolant hoses -1- and -2-.
– Mark (to avoid interchanging) and disconnect electrical con‐
nectors -1- and -2-.
– Unscrew bolts -1-, -2-, -3- and -4-.
– Pull off refrigerant lines.
– Unscrew bolts -2-, -3- and -4- from bracket of heat pump
valve unit -1-.
4. Valve unit of heat pump
87
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
– 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 re‐
frigerant circuit ⇒ Air conditioning systems with refrigerant
R744 – General notes; Rep. gr. 87; Refrigerant circuit; Re‐
newing components.
– 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.
– ⇒ Rep. gr. 19; Cooling system/coolant; Filling cooling system
Tightening torques
♦ ⇒ Rep. gr. 87; Assembly overview – valve unit of heat pump
♦ ⇒ Rep. gr. 87; Assembly overview – refrigerant lines
88
Rep. gr.87 - Air conditioning system
ID.4 2021 ➤
Heating, air conditioning system - Edition 09.2021
♦ ⇒ Rep. gr. 87; Assembly overview – air intake unit of heater
and air conditioning unit
♦ ⇒ General body repairs, exterior; Rep. gr. 66; Underbody
cladding; Assembly overview – underbody cladding
4.3
Removing and installing refrigerant ex‐
pansion valve 1 [N636]
Special tools and workshop equipment required
♦ ESD workplace -VAS 6613-
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 con‐
nectors -2-.
– Unscrew bolts -3-.
– Remove refrigerant expansion valve 1 -N636- and refriger‐
ant shut-off valve 1 -N696--1-.
4. Valve unit of heat pump
89
2024 VW ID.4 Owner's Manual
