Get Air conditioning system -> 1.2.16 Pipes and hoses in refrigerant circuit 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 quick release couplings come in different versions -A- and

-D-. On both versions of these quick release couplings, the

refrigerant lines -C- can be released and removed in the same

way, e.g. with refrigerant line release tool -T40149/1- ⇒ Heat‐

ing, air conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-

specific workshop manual).

♦ For quick release coupling version -A-, the control pins -B- be‐

come visible after installing the refrigerant line -C- once the

engaged refrigerant line -C- is pulled in the direction of arrow.

♦ For quick release coupling version -D-, the refrigerant line

-C- is installed in the same way as quick release coupling

-A-. When the refrigerant line -C- on this version is pulled in

the direction of arrow following assembly, the snap ring -E-

protrudes from the quick release coupling -D-, thereby indi‐

cating that the retaining ring -F- is completely engaged with

the refrigerant line -C-. The snap ring -E- must then be re‐

moved from the refrigerant line -C-.

1.2.15

Seals

♦ These seals seal the connection points between the individual

components of the refrigerant circuit

⇒ “3.2 Refrigerant circuit seals”, page 8 .

1.2.16

Pipes and hoses in refrigerant circuit

♦ In its pure state, R1234yf refrigerant is chemically stable and

has no corrosive effect on e.g. iron, aluminium and specially

developed plastics that are suitable for this purpose. A mixture

of refrigerant oil and R1234yf refrigerant can affect certain

metals (e.g. alloys with copper) and affect or degrade certain

hose materials and plastics. Therefore, use only genuine re‐

placement parts ⇒ Electronic parts catalogue .

♦ Only use components that are resistant to R1234yf refrigerant

and its associated refrigerant oils. Do not use components

(such as seals and hoses, which are made of plastic) that

cannot be clearly allocated ⇒ Electronic parts catalogue .

♦ The pipes and hoses are held together by threaded connec‐

tions and / or special joints ⇒ Heating, air conditioning; Rep.

gr. 87 ; Refrigerant circuit (vehicle-specific workshop manual).

♦ Renew the sealing elements (e.g. seals) between the compo‐

nents ⇒ Electronic parts catalogue .

♦ For threaded connections, observe the specified torque set‐

tings. For pressure-fit connections, use dedicated release

tools ⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant

circuit (vehicle-specific workshop manual).

Rep. gr.87 - Air conditioning system

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

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

1.2.17

High-pressure safety valve

The high pressure safety valve is fitted to the air conditioner com‐

pressor or the receiver.

The valve opens at a pressure of approx. 38 bar (overpressure)

and closes again when the pressure has dropped (to approx. 35

bar).

Not all the refrigerant is lost from the system.

Note

♦ Depending on the version, a transparent plastic washer -B-

may be attached to the high pressure safety valve -A- which

breaks off as soon as the valve is actuated.

♦ Depending on the version of high pressure safety valve -A-, a

cover -C- may also be pushed onto the high pressure safety

valve -A-. Should the pressure in the refrigerant circuit actually

rise above the opening pressure of the high pressure safety

valve -A- and cause the valve to open, refrigerant will not es‐

cape in one direction but scatter through the openings -D-

beneath the cover -C- instead.

♦ If a high-pressure safety valve -A- needs to be renewed, the

specified torque for the new valve (depending on the manu‐

facturer and the version of the air conditioner compressor)

must be observed when installing. Air conditioner compres‐

sors manufactured by “Denso”, “Sanden” and “Valeo” are

equipped with an O-ring seal (currently valid torque settings

are: 10 Nm for “Denso” and “Zexel/Valeo” air conditioner com‐

pressors, and 15 Nm for “Sanden” air conditioner compres‐

sors). Air conditioner compressors manufactured by “Delphi”

are fitted with an oil seal (currently valid torque setting: 15 Nm).

♦ Renewing seals (oil seals or O-rings) ⇒ Electronic parts cata‐

logue .

♦ If a seal (oil seal or O-ring) fitted to the high-pressure safety

valve is not available as a replacement part, the removed old

part can be reused (as an exception to the general rule of using

new seals only). The old seal, however, must always be

checked for damage prior to installation. If any damage or de‐

formation is detected on the old seal, it must be renewed with

a commercially available new part ⇒ Electronic parts cata‐

logue .

♦ After filling the refrigerant circuit, check the installed high-

pressure safety valve for leaks using e.g. an electronic leak

detector.

1. Refrigerant circuit

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Air conditioning system -> 1.2.16 Pipes and hoses in refrigerant circuit for Your Volkswagen Touran 4 Door Second Generation (2015-2022)

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