Get Air conditioning system -> 1.6.5 Principle circuit diagrams for cleaning (flushing circuits) - refrigerant circuit with restrictor and receiver Guide for Volkswagen Touran 4 Door Second Generation (2015-2022)

Arteon 2018 ➤ , Atlas 2017 ➤ , CC 2012 ➤ , Caddy 2016 ➤ , Crafter 201 ...

Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

Note

♦ The arrows in the following illustrations show the direction of

refrigerant flow during flushing (during flushing, the refrigerant

flows against the direction of flow with normal air conditioning

operation, which is why the high pressure side of the air con‐

ditioner service station is connected on the low pressure con‐

nection of the refrigerant circuit to the air conditioner

compressor).

♦ This principle circuit diagram shows a refrigerant circuit with

expansion valve, receiver and a second evaporator (extra

equipment on certain vehicles).

♦ On vehicles with expansion valve and receiver, the expansion

valve is removed and an adapter installed in its place. The

receiver is also removed depending on the vehicle and the line

connections to the receiver are joined together with 2 adapters

and a filling hose.

♦ On vehicles with just one evaporator, the components from

position “16” are not installed or not required.

♦ Depending on the design of the air conditioner service station

there may be non-return valves installed between the refrig‐

erant circuit and the air conditioner service station (to assure

the correct direction of refrigerant flow during flushing).

♦ The adapters from the adapter case for VW/Audi passenger

vehicles have a 5/8 -18 UNF thread. To ensure that the charge

hoses of the R1234yf- air conditioner service station can be

connected, additional adapters from the case are to be used

adapter case for VW/Audi passenger vehicles ⇒ Electronic

parts catalogue .

♦ Installed in the refrigerant circuit on vehicles with a high-volt‐

age system are electrically actuated valves that have to be

removed for cleaning (flushing) and replaced with manual

shut-off valves or adapters ⇒ Heating, air conditioning; Rep.

gr. 87 ; Refrigerant circuit .

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

1 - Air conditioner service sta‐

tion

❑ With electronics and

flushing program, air

conditioner service sta‐

tion with flushing device

⇒ Electronic parts cata‐

logue (Tools; Workshop

equipment/tools; Air

conditioning system/

heating)

❑ If an air conditioner

service station without

flushing program is

used, the sequence has

to be carried out man‐

ually (evacuate, flush

4 times with at least 3 kg

of refrigerant each time

and extract refrigerant

again, evacuate).

2 - Refrigerant hose of air con‐

ditioner service station

❑ From high pressure side

of air conditioner service

station (normally col‐

oured red) for connect‐

ing low pressure side of

air conditioner compres‐

sor to refrigerant circuit

(larger diameter)

3 - Adapter for connection to

low pressure side in refrigerant

circuit

❑ Different versions de‐

pending on vehicle

⇒ “1.6.8 Adapters for

setting up flushing cir‐

cuits”, page 105

❑ The item to be used between the refrigerant hose -2- and adapter -3- is adapter - VAS 6338/48- .

❑ From adapter case VW/Audi passenger vehicle set

❑ Depending on the version of adapter, an additional adapter is required here to connect the charge hose

of the air conditioner service station

Note

♦ The charge hose of the air con‐

ditioner service station has an

M12 x 1.5-6G external thread in

accordance with SAE J639. Lo‐

cated on the adapter for connec‐

tion of the low pressure side is a

5/8 -18 UNF external thread. To

ensure that both components

can be connected together, an

additional adapter is required ⇒

Electronic parts catalogue

(Tools; Workshop equipment/

tools; Air conditioning system/

heating).

1. Refrigerant circuit

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

♦ To attain the fastest flow speed

possible, the service coupling is

removed from the charge hose

for purposes of flushing (bottle-

necks are present in the service

coupling that would significantly

reduce the flow speed).

4 - Connection of low pressure side in refrigerant circuit

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

5 - Adapter for removed expansion valve

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case for VW/Audi passenger vehicles ⇒ Electronic parts catalogue (Tools; Workshop

equipment/tools; Air conditioning/heating)

6 - Evaporator

7 - Connection to receiver

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ Not fitted in vehicles with a dryer cartridge in the receiver on the condenser or with a receiver installed

in the condenser ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System overview - refrig‐

erant circuit (vehicle-specific workshop manual).

8 - Adapter for bridging removed receiver

❑ Not required on all vehicles

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle set

9 - Charge hose for refrigerant

❑ For example charge hose from adapter case VW/Audi for passenger vehicles

⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

10 - Condenser

❑ If a receiver with dryer cartridge is fitted at the condenser, the dryer cartridge must be removed (seal

receiver at or in condenser again following removal) ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant

circuit; System overview - refrigerant circuit (vehicle-specific workshop manual).

❑ If the receiver is attached directly to the condenser, flush the system before removing and renewing the

receiver ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; System overview - refrigerant circuit

(vehicle-specific workshop manual).

Note

On certain vehicles, the receiver is

integrated in the condenser and the

desiccant cartridge cannot be re‐

newed individually or is not availa‐

ble individually as a replacement

part. On these vehicles, the con‐

denser in this case is to be renewed

with the receiver ⇒ Heating, air con‐

ditioning; Rep. gr. 87 ; Refrigerant

circuit; System overview - refriger‐

ant circuit and ⇒ Electronic parts

catalogue .

11 - Connection for high pressure side on refrigerant circuit

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

12 - Adapter for connection of high pressure side in refrigerant circuit

❑ Different versions depending on vehicle ⇒ “1.6.8 Adapters for setting up flushing circuits”, page 105

❑ From adapter case VW/Audi passenger vehicle set

100

Rep. gr.87 - Air conditioning system

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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017

13 - Charging hose of flushing device for refrigerant circuits

❑ From connection to high pressure side of air conditioner compressor on refrigerant circuit (smaller di‐

ameter) to inlet of flushing device for refrigerant circuits.

14 - Flushing device for refrigerant circuits

❑ Different versions and different design of flushing devices for refrigerant circuits ⇒ Electronic parts cata‐

logue (Tools; Workshop equipment/tools; Air conditioning/heating)

❑ With filter, sight glass, safety valve, heating, refrigerant tank, etc. (depending on version).

❑ Depending on the design of the air conditioner service station and the flushing device for refrigerant

circuits, there may be a non-return valve installed at the outlet of the flushing device for refrigerant circuits

(to assure the correct direction of refrigerant flow during flushing).

❑ Depending on the flushing device there may be a 5/8 -18 UNF external thread, a connection for R134a

or a R1234yf high pressure service coupling at the outlet to the air conditioner service station

Note

♦ To ensure that the flushing de‐

vice can be connected to the air

conditioner service station ,

flushing devices with a 5/8 -18

UNF external thread or a con‐

nection for an R134a low pres‐

sure service coupling require an

additional adapter to facilitate

connection of the R1234yf low

pressure service coupling or the

charge hose to the air condition‐

er service station (with an M12 x

1.5-6G external thread in ac‐

cordance with SAE J639) at the

outlet of the flushing device.

♦ The charge hose of the air con‐

ditioner service station has an

M12 x 1.5-6G external thread in

accordance with SAE J639. De‐

pending on the type of service

connection, there may be a low

pressure service coupling in ac‐

cordance with SAE J639 for the

R1234yf refrigerant, an M12 x

1.5-6G internal thread in accord‐

ance with SAE J639, a service

connection for an R134a low

pressure service coupling or a

5/8 - 18 UNF external thread on

the flushing device for refrigerant

circuits. To ensure that both

components can be connected

to each other, an additional

adapter may be necessary ⇒

Electronic parts catalogue .

♦ Since refrigerant is only drawn in

by the air conditioner service sta‐

tion at a low flow speed, the low

pressure service coupling can be

used here.

15 - Refrigerant hose of air conditioner service station

❑ From the low pressure side of the air conditioner service station (normally coloured blue) to the outlet of

the flushing device for refrigerant circuits.

16 - Adapter to seal outlet to second evaporator

❑ Only required on certain vehicles with “second evaporator” (optional equipment)

❑ From adapter case VW/Audi passenger vehicle set

1. Refrigerant circuit

101

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Air conditioning system -> 1.6.5 Principle circuit diagrams for cleaning (flushing circuits) - refrigerant circuit with restrictor and receiver for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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